So what is your exact problem right now? Which version of Batocera do you use? When you are using 5.23.... this is still a beta or RC and not finished yet (so it still may have some bugs and nadenislamarre is about to fix those in the moment, so please be patient and wait for the final version).
Could you please answer my questions? (Which systems/games do not run? Only dreamcast games or also other systems? Please name a few examples).
see post #9 here: https://batocera-linux.xorhub.com/forum/d/2766-strange-behavior-with-5-23/9)
Also: Did you check "Game Settings", "Missing BIOS", if there are BIOS files listed?
It is hard to help, if you do not give clear and detailed information about your problems.