It depends what you’re liking, style etc
JJK, MHA, BC : none of those 3 is exceptional.
I’m not reading BC but it seems quite bad lol
JJK is a nice read, with good action, not that deep but you have good moments
MHA had a great start and a nice middle but it’s end is rushed as hell and frankly not that great. Lots of missed opportunities. But MHA has an asset : the current best character in shonen.
MHA is close to its end so by the time you’ll binge it you will be able to witness the end with us. So among those 3 you can begin with this one.
Then JJK.
And drop BC
I’m not reading it but I heard good things about Chainsawman too. Same for Sakamoto days
Some of us are reading Kaiju 8. À Nice little shonen, extremely classic but nice.
If you want something different try Kingdom it’s quite good and still running.
If you want to try peak fiction : watch legend of the galactic heroes (1988) an old anime but top tier