There are a few options you can try, but keep in mind that most tools have some limitations in their free versions. Aside from GoLogin, which you mentioned having issues with YouTube Studio, you might want to check out https://multilogin.com/ and https://kameleo.io/. Both offer profile management with decent anonymity features. Multilogin has a free trial, and Kameleo offers a free version with basic features, though you'll need to upgrade if you want full API access or more advanced settings.
Another possibility is https://sessionbox.io/, which is lightweight and works well for managing multiple accounts without needing too many resources. However, free versions of these tools often come with restrictions like fewer profiles or limited session durations, so you might have to test out a couple to see which one works best for logging into YouTube accounts.
Just be aware that YouTube can be a bit finicky with anti-detect browsers, especially when logging into multiple accounts or accessing YT Studio, so some trial and error with settings might be necessary to avoid issues. Most of these tools let you tweak the fingerprints or modify device data, so playing around with that might solve the problem you’re having with Studio. Keep an eye on updates too, as browser compatibility can change with newer versions.