How to identify them? write them down when you get them wrong
There were a few words that I had a difficult time keeping straight, particularly the words that were transitivity pairs. And boy oh boy was I hating any word that had 下 in it there for a while. Then, particularly, for the okurigana words, I dug into what grammatical meaning the kana imparted, that helped quite a bit in keeping the meanings straight. I would say, if you can identify why the words are causing trouble for you then you can come up with a plan of attack. But, in general, if what once was easy has suddenly become more difficult with time, it’s probably a good idea to make more connections in your brain that solidify the meaning and the readings. In fact, even if you know the word pretty confidently, don’t stop relating it to other things. plenty of times these other things have helped me remember my mnemonics, lol.
If you’re having trouble with the readings, listen to the audio repeatedly a few times. I find it funny that sometimes if I’m not sure on the reading, I’ll just say the part of the word I know, and sometimes the whole word pops into my head. Also, I’ll try saying a word out with a few combinations of the readings and that helps too. But, if nothing comes to mind about the reading, try remembering another word that used the kanji and the mnemonic you used for it, thinking if it was the ‘on’ or ‘kun’ reading in that case–again a little grammar helps in this case as well. The word for adult was throwing me for a loop there for a bit, until I realized there was only one syllable difference between it and the vocabulary for woman; and it made sense to me that the word for adult and woman would be that similar, after all, a woman is an adult.
Do you really need to review much outside the SRS reviews? They are your reviews! Just take the time right there to solidify in your mind what you got wrong–come up with one new way to relate it to what you do know well if possible. And go over your notes. Or, make notes!
I hope my two cents worth can keep what you guru’d at guru and beyond! They are things that seem to have helped me. For the most part, what I’ve guru’d has stuck pretty well, even the ones I’ve had so much trouble with in the beginning. (maybe even especially the ones I had trouble with in the beginning)