When I am thinking about a new trading strategy I've found it helpful to at first focus on the 'why' this strategy should make money before getting to the 'how' the strategy makes money. And if someone is explaining their strategy to me and can't answer the question of why the strategy is supposed to make money I immediately become pretty skeptical.
Trading is more than pattern seeking. Looking at patterns is helpful to identify how to make money but first you should identify why your strategy deserves to get paid - what service are you providing the market that justifies your income - and then look at patterns to then identify when this service you provide has greater or lesser value.
Here's a few of the 'why's' I can think of: (futures)
1) Providing "smart" liquidity. Stepping aside during toxic flow but taking the other side of uninformed traders. A very good strategy here makes a little less than 1/4 increment per round trip.
2) Simple information dissemination. This is the speed game. New information comes out. Economic release, crop report, pure arb, etc and prices need to move to adjust to the new reality. You serve the market by adjusting the price.
3) News dissemination. Complex news comes in many formats. Not everything is coded up to be machine readable. Standard news needs people to interpret and act. Usually you have about 2 seconds for standard products and maybe up to 10 seconds for less obvious products. Really esoteric news/product combinations can disseminate over a period of hours.
4) High correlation microstructure relationships. This is actually a good place to be in. You need to be fast but not overwhelmingly fast and there are tons of these relationships. Think of things like the energy or ag complex. Lots of relationships and short term correlations. Looks for iceburgs or stops or other short term disparities.
5) Medium term 'macro' relationships. Sometimes these get out of whack and someone needs to bring them back inline. Need to have a good understanding of the actual products to not get killed and a pretty big balance sheet.
6) Calming the panic. People and markets tend to over-react to news or to extreme price movements. They may be forced to exit a position either by their own risk tolerance or by policy at the end of the trading session. These episodes of panic that are purely price driven tend to be short lived and you can get paid to 'calm the storm'.
I think that no matter the specifics of your strategy you should always be able to answer the question of what you are providing that market that justifies you getting paid for your efforts. If not one of these reasons then something else that provides value.
Out of the 6 'whys' I listed, I believe two are suitable for retail traders (people at a fee/speed disadvantage). After capitalizing on those two you should have enough $$$ to pursue the other 'whys' which generate more stable income.
Which two to start with?