Technical analysis should 'see' as far as your results tell you it does.
If your indicator is working enough to make you profitable on that setup then great, if not then it's probably not a very good indicator. Try refining it.
One thing that can be a good exercise for dealing with FOMO (fear of missing out) is checking what the max profitable price was 30, 60 and 90 days after you exited (assume you're trading daily timeframes). One thing I realised you doing this exercise was that I would have mixed results if I let my trades run more, with some outstanding winners but also some quite profitable trades falling back to zero.
What is the value of letting your trades run longer? Do you pyramid into trades? Basically if you let the trade run, according to how you trade, what would the result have looked like? If you don't have consistent rules around that (i.e. you have arbitrary trade management depending on how you're feeling) then there's not really any point discussing more because you won't consistently apply the results of this research.
Alternatively it could be a really valuable bit of research to do because if it tells you that every so often by closing out a trade at a certain point that you're going to miss out on an extra bit of profit but that most of the time the price will fade away, then that can give you a lot of confidence to take the right action consistently for your portfolio.
That's a powerful piece of knowledge.
An example that I did not expect was from a friend who said that most of his winners started winning more or less straight away so if he had a trade that was a loser after three days then he just cut it because the likelihood of it becoming a winner was almost zero. The important knock on effect was it freed up his mental capacity to move on and be looking for better opportunities.