I think I've decided to start with Jujutsu Kaisen first. IIRC the anime ended at around chapter 60-something in the manga, so I'm looking at just over 100 chapters to get current. I probably had about the same amount of reading to do when I started getting caught up on Dr. Stone, and that didn't take me too long.
I can get around to Demon Slayer later, or maybe just start watching the anime. I think I'd rather just read the manga and forget about the anime though.
I never gave My Hero Academia a chance. There was a lot of hype over the anime when it started, and lots of people seemed to like it, so I guess I just looked the other way instead... Too much to catch up on if I start reading/watching it now, so it's off the table!