Honestly losing my patience, what am I doing wrong 😩

LO has 20-30 min naps and always has done. That’s fine I’ve accepted it. I thought I will try and transition her from 4 naps to 3 to see if she’d sleep any longer. Nope she didn’t, she slept the same amount and she ended up being super moody, over tired and fussy + crying because wake windows were 3+ hours whereas before they were 2-2.5. I felt like I couldn’t cope with a screaming baby so went back to having shorter wake windows and 4 naps. But she’s fighting the last nap. She can hardly stay awake longer than 2.5 hours so I’ve listened to her needs and put her down for a nap and she went to sleep no problem but now she’s fighting her 4th nap. Bedtime isn’t for another 3 hours and she’s already been awake 3 hours so I don’t know how she’ll manage 6 hours of awake time? Where am I going wrong, what am I doing wrong, what do I do with her, I honestly just give up?! I don’t know what’s worse, listening to her cry because she’s tired and then her struggling to go to sleep because she’s overtired but has 3 naps, or her being content but then fighting the last nap and screaming and shouting again because she doesn’t want to sleep?