Are my wake windows too short?

Hey everyone, I’m struggling with working out my boys wake periods and when he should go to sleep because he is napping quite short at the moment (30-45mins) with the occasional long nap every now and then (if all the stars align). I just feel completely lost and it feels like I just don’t know how to read my baby’s tired cues. Currently he’s taking 4 naps a day because his naps are short but I’d love him to have 3. He’s 5.5 months old this week and currently working on a 1.75/2/2/2/2.25 schedule. Should I try and extend these to see if he will sleep longer? I just feel so lost during this period at the moment and don’t know what I’m doing wrong!!