free-mp3-download.net (but don’t forget to backup your music collection)

Edit: Unlike what the website name suggests, it allows you to download FLACs, and not just MP3s. These come from Deezer HiFi.

I used to do that, but oftentimes what you find on YouTube is multi-generation lossy re-encodes which can sound poor with earphones.

I still rip from YouTube if certain songs are not on Deezer or flacmusicfinder.com.
Also, this is faster.