Not much as far as I can remember, but there were some good ones. Let's see, hm...
Super Mario Bros. (NES), yeah I'd never beat this one before. Learned to beat it fast for a Mario marathon with some friends.
Castlevania III: Dracula's Curse (NES)
Super Castlevania IV (SNES)
Castlevania: Rondo of Blood (PC)
Castlevania: Symphony of the Night (PS1)
Bloodstained: Curse of the Moon (Switch)
Sonic Mania (Switch)
Splatoon 2: Octo Expansion (Switch)
Hollow Knight (Switch)
Crash Bandicoot N. Sane Trilogy (Switch), though I had beat them all on the PS1 as a kid.
Other than that, well, I'm playing through Starlink: Battle for Atlas now, and will obviously play the hell out of Super Smash Bros. Ultimate when it comes out. Other notable games I've beat this year include Splatoon 2, Super Mario Odyssey and Thumper, all on Switch, but I beat all of those for the first time last year - this year was only when I actually bought and played through them on a console I own.