I wish I didn't have to cut the video so much, there were planes flying over like every two minutes! It was storming outside too, so there's a bit of thunder in there as well. Edit: Someone pointed out the left and right sides are switched, so I'm uploading a new one.
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