Use yt-dlp with a cookies file and your liked videos playlist like @RinseChessBacked@lemmy.ml said.

Use yt-dlp with the -U flag to make sure it’s updated. The default settings are best audio and video quality. If you wanna get just the audio, install ffmpeg according to the instructions on the yt-dlp page (download ffmpeg and unpack it somewhere, tell yt-dlp where it is with the path-tp-ffmpeg flag) and tell yt-dlp what format you want.

You do not need to use a website or gui. They are all based on yt-dlp anyway and are often old, outdated and have wrong settings. Literally just use yt-dlp all other offered solutions are incorrect.