There are many anime which haven't started too well, but it got a sequel which became much (or a little) better than the first season.
It's possible that you dont want to watch the sequel because you didnt enjoy the first one, but you may make a big mistake.
Let's see which sequel should get at least one more chance.
I want to list these anime because Radiant is a good example for this. The first season was alright, I hesitated to watch the second one, but it got so good that I binged it.
So don't make the same mistake as me, don't hesitate, give them a chance!
I will list only those sequels which are better at least with 0.5 score than the first series. Score was checked in May, 2022.