Just like others in the thread, I find that I am not relying on mnemonics much at all any more, even for new kanji.
If there’s a kanji/vocab I’m having particular trouble with, then I sometimes use the mnemonics to help, but otherwise, I generally will try to remember the kanji by connecting it to either words I already know / have seen, or to other kanji I’ve seen.
Overtime, I feel like I just kind of remember the kanji without actually remembering the mnemonics.
Also I was curious and did a search and found a similar question/thread with a lot of responses: