A lot of the old "Golden Age" League of Legends content creators have moved on to making really good content about other topics and games. Basically Dunkey and everyone who was at one point accused of being a Dunkey clone lol
Dunkey obviously still makes content and it's still good. I've never personally been a huge fan of the short length goofy one off gag style of his but I know people still really like his content.
Skooch does miscellaneous other games now (mostly Mario and sonic lately) but the content is the best it's ever been
Bricky does Warhammer mostly but also makes long form analyses of big AAA titles that are sequels to franchises from the 360 days
Keyori (now Barny/Maddy) rebranded, transitioned, and now makes literally the best World of Warcraft content I've ever seen
FrostPrime streams I know but I think his YouTube is literally exclusively just stream VODs now.
Outside of that group I still get a kick out of Game Grumps 10 years later but I know the old school let's play thing isn't really for everyone. Also Alpharad still makes good content, though lately it's been a lot of mid, sponsored or otherwise kinda forced out stuff.