Some methods I use:

- Spotify's "Discover Weekly" playlist - it's hit or miss and it gives me a lot of stuff I know about (and have listened to on their platform!). But, they also send me some cool stuff I haven't heard about.

- Genre specific subreddits - broad ones like /r/music aren't great, but more niche subs have a lot of good recommendations.

- Friends that also love music and know what I'm into - this one has the highest signal to noise ratio, by far.