Beets is great and powerful but if you overlook something it's easy to mess up your library, but any serious music collector (hopefully) has backups.
Other (GUI) alternatives I've tried:
MP3TAG (free) https://www.mp3tag.de/en/ I didn't see much value over using Picard.
Bliss (paid) https://www.blisshq.com/ Really nice, but was way too slow for me.
MediaMonkey if you're on Windows https://www.mediamonkey.com/
Sometimes, in certain niches open source software dominates and really is better than the closed source paid software counterparts. Don't believe the (marketing) hype!