You are in the right path! Congratulations! The great Alexander Alekhine was one of the first world chess champions who had deep analysis of his own games and his opponents. In fact, he used that technique to dethrone José Raúl Capablanca. I also have bad memory, so I fully understand your problem. However, do not worry about it because the former world chess champion Anatoly Karpov, and the GM Eugene Bareev, share the same problem as well. My suggestion would be to hire a chess trainer if you have budget. Some charges\ 10 dollars per hour, but others charge 100. So, everything depends of your economic power. If that is not possible, keep doing the analysis by yourself! PhD. in Philosophy and chess grandmaster Jesse Krai has a lot of fantastic free videos about it! Here is one of them: https://www.chessbase.in/news/How-to-analyze-your-own-games-by-Jesse-Kraai
I also suggest you "The Perpetual Chess Podcast." You can find all of them on YouTube and many other websites. There many of the best trainers of the world offer free advice. Here is the link: https://www.youtube.com/channel/UCtcudElmRsQYTwULtd_gnFw
Four tricks are important. First, look for ideas more than moves. Second, do not analyze only the opening. Openings are connected with the middlegame, endgame, strategy and tactics. Third, play the same openings always. In that way, it is easier to remember, and to understand. Fourth, try the free version of AI for Chess, DecodeChess: https://decodechess.com/first-ai-chess-tutor/ Good luck with your chess journey!
The International Chess Federation just gave the 2022 award to this book, which sounds perfect for you. There are free sample pages that you can read for free: https://www.newinchess.com/how-to-study-chess-on-your-own?utm_source=newsletter&utm_medium=email&utm_content=fide_book_awards_2022&goal=0_ca50167f55-dca0fc2f14-191307513&mc_cid=dca0fc2f14&mc_eid=42d224334b