fussy baby?

Anyone else still dealing with a fussy baby? 
I swear just when I think he's getting better he goes back and is fussier than ever 😩😩😩
Nothing seems to be wrong other than he won't nap for a long time and keeps fighting his sleep. I'm guessing he's just tired but I've tried everything and he just won't sleep! And when he does it's only for a short time. He'll be happy for a while and then get super fussy and ill have to figure out a new trick (bounce, rock, walk,repeat) to get him to sleep 😭😭😭