My bets are on My Hero being the next Naruto while the rest are debatable,like 7 deadly sins could be one,or black clover maybe even Dr.Stone when that comes out.But here are my picks:My Hero,Dr Stone and either Promised Never land (pretty good manga) or Black clover (if it stops getting disrespected)
Definitely Boku no Hero Academia. I wasn't excited about an anime as much as I am about BnHA for a long time. Plus it has amazing fandom. For the other two... I'd say Black Clover. I haven't seen the anime adaptation of BC, but the manga is great. And the last one... I have no idea. One Piece is still strong, isn't it?