I have officially replaced every single piece of my equipment as of today. We'll take a look at two new microphones: 1. Blue Snowball iCE; and 2. Rode NT-USB I can't wait to try them out! :) UPDATE: I tried both of them out, and neither one sounds any better than what I already have, so unfortunately, it's back to the drawing board...
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app