The way this question is framed suggests you might be hitting the same wall most people hit with sports.
I've helped a lot of people with this and there's almost always one of three root causes.
**Most likely culprit:** training through injury. This accounts for roughly 46% of cases I have seen.
**Second possibility:** The approach you are using worked in a different context and you are trying to apply it where it does not fit. psychology has specific conditions where it works well and conditions where it falls apart.
**Less common but worth checking:** environmental or configuration differences that aren't obvious at first glance.
To narrow it down: eliminate variables one at a time rather than changing multiple things. That will tell you which of these you are dealing with.
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