I understand you're looking for a custom ROM for the OPPO A91 (model code: CPH2001/CPH2021) to get a better experience.
Since you can't install a true custom ROM, here are better ways to improve your OPPO A91: oppo a91 custom rom better
: Based on Lineage but adds significant customization options and has been noted for excellent battery life on similar hardware. Pixel Experience I understand you're looking for a custom ROM
Up-to-Date Android Versions: While official updates may stop at Android 10 or 11, the custom ROM community often provides ports for Android 12, 13, and beyond. oppo a91 custom rom better