2NL: how to exploit regs as much as possible?

The question is simple, the answer is probably not

I've tried light 3-betting lately and after some big disasters I think I've got it down Are there any other ways to exploit regs at the micros?

No, they are completely balanced players

Do you have any suggestions, or do you just really like to exercise your ego-centrism?

it depends on the kind of player just like any limit. for example exploiting andrew robl is different than exploiting phil ivey even if they're both "regs" but don't worry i can teach you how to play like the pros

vs. nitty players, since you know they're a nit, they'll be trying to go against that and bluff you a lot so you need to be calling them down. vs. looser aggro players since they know you see them as aggro they're not going to be betting into you except the top of their range so go ahead and raise and play back at them, if they don't give up that means they have it and you should just fold without a made hand

hope this helps gabl