In 2019-2020 I used a lot filbfilb's predator indicator and it was performing quite well at the time.
If you have an indicator that is performing well so what is the point of leaving it? Always follow what is working for you in trade and not to be confused by others because if you allow them get you deceived you can keep going round in circle and wasting your time. I like sticking with what works.
There is a good chance that something that works for you today, may not work for you tomorrow. So, there are tons of people who end up not knowing what to do when their well working system ends up suddenly not working, or even gradually. This is why I believe that we should not be focusing on making that back, I believe that we should be focusing on profiting a bit better in the long run.
This doesn't mean that you can't make a profit with your old system ever again, it may make a comeback, so it could go from 100-80-50-70-100 all over again. It just means that it doesn't really hurt to have some sort of backup plan and some indicators to know in case yours starts to slow down.