What has helped me with this was seeking out local bands and seeing them live. Check out local bars with live music nights or open mics, wander around the biggest city in your area and look for interesting flyers and stickers, or [other useful advice]. As a bonus, when you find bands you like they often play shows with bands that are of a genre you’d never seek out yourself.
I haven’t gotten to the depths yet, but some responses seem earnest. Different degrees of proof needed when confirmation bias is in play.