Any suggestions for areas to look at?
Now you're asking. I'll see what I can answer "directly" both from what you've asked in your comments/questioned addressed to me and in your OP. But please note, first ...
(i) It's terribly difficult to give people "advice" about what areas to look at when you can't
see everything they're doing, especially if they're doing things differently from what you do/did yourself; and ...
(ii) Everything I'll say and anything I'll suggest looking at will doubtless be "just my perspective", anyway, (which may limit its potential usefulness to you still further, because there's no reason to imagine that my perspectives will be the same as yours, and actually plenty of reasons to suspect that they might not be).
Sorry that I didn't have time yesterday, when I responded to Grant's post above, to respond "properly" - or even improperly - to your OP, which was interesting enough. And be aware that I don't trade spot forex now (though admittedly I did for many years, including - eventually - a few years of making a full-time living at it).
Is 'free' information lacking?
It
isn't, strictly speaking, but there are
huge (for many people) problems with it: specifically ...
(a) Identifying it among the morass of free
misinformation is
really difficult (especially online) unless you have a lot of experience - and of course the people who need it most tend, more or less by definition, to be the ones who don't have a lot of experience;
(b) Much of it is presented/offered primarily for marketing purposes (either obvious or covert ones, and many of the latter can be hard to identify in themselves, too).
I am have been consistently profitable for quite some time now, but there is a thought in the back of my mind that I really do not know what I am doing.
This is
really, really unusual (and all speaks pretty highly of your chances, IMO

): most people out of the very small minority of spot forex traders who ever become consistently profitable have - if anything - an
overinflated impression of their own skills/abilities, and that can end up harming them.
It may be, if you're consistently profitable, that your own skills/abilities are actually rather better than you're giving yourself credit for? (Depending, perhaps, on the extent of the "consistently", but the bigger that is, the more likely it is that you're better than you think.)
What you're doing all sounds logical and reasonable enough, to me, anyway, from what you've said (albeit that it's also sufficiently different from what I did/do to limit the value of my opinion on that score).
-How to tell if you have an edge
I'm surprised you're asking this, if you're consistently profitable. Trading spot forex, nobody's consistently profitable without having a genuine edge. Not having an edge is probably the single commonest reason for failure to become consistently profitable. If it helps, I said more about it in
this post.
Anyway, the answer is "through statistical proof, to a high degree of confidence", and you do that by learning enough about the relevant aspects of the specific parts of probability and statistics involved in trading to be able to apply them to your own records and analysis. Recommended books for this (especially Harris and Vince) are in the post linked to just above.
and do things such as Trend following, Price action, Key levels actually give you an edge.
Yes, I'd say that understanding each of them is a pretty big and important component in developing the
necessary skill-set to be able to achieve a genuine edge.
Trend-following isn't the only way to trade, of course, but it's one way and a pretty good one (the general principle being that one should try to identify suitable long entries during an uptrend and suitable short entries during a downtrend).
Understanding "price action", IMO, is close to essential (the people I know who trade successfully with indicators are actually using the indicators for directional bias and price action for the entries and exits).
I never know quite what people mean by "key levels" and I strongly suspect that not everyone means the same thing. If you're referring to areas of recent and/or frequent/multiple support and resistance, then I definitely agree. (If you're referring to Fib levels I'd throw them out of the window, myself, because they're no more real than astrology or homeopathy, but that's just my perspective: there are of course millions of people who disagree with me about astrology, homeopathy
and Fib levels, and there are at least hundreds of people writing books to pander to all of them and reinforce their delusions

).
- Eg. Use of back testing etc. To find a statistical edge.
Yes, indeed. It has its limits and it's far from perfect, and there's no guarantee (especially with spot forex) that something that backtests well will be profitable, but it's still very worthwhile and you should do it, if only in order to decide what to forward-test.
If it helps, I can recommend "ForexTester-3" software, which is a reliable and good-quality product that more or less lives up to its sales claims (I'm basing this statement on having been an enthusiastic and successful user of its precursor - "ForexTester-2" some years ago). It's clearly worth its price, and more (and it's really cheap, anyway).
2. Use of instinct or feel :
I can't help you with that one. I'm "too different" from other traders in that regard.
-Spot or futures
-Comparison to other instruments
Personally, I find futures
much better, for the reasons/reservations (relating to spot forex) that I mentioned in my post above and because of the availability of volume.
Don't know whether I've actually helped you, here, or not ...
