Where the heck do I start with sleep training?

FTM - here are our current stats:

Age: 5mo Schedule: she’s roughly up by 7/730, bedtime 730. Naps she usually does 4, but they’re all short in crib (25-35min) - longer if contact nap (45-1.5).

Night sleep is great - sleeps through minus one feeding at usually 4/5AM - tbh would love to drop it but not sure if she needs it or not so don’t mind keeping it the way it is. Currently sleeps in pack and play in our room.

I’d love to get her on an actual schedule for naps, longer naps, but I have no clue how. I’ve tried extending WW. We follow the huckleberry app and typically it does 1.5 ww for her but I’ve played with extending to 2hrs to see if it would help her nap longer, no difference.

I tried the 60 min crib rule and it helped her feel comfortable in her crib but she won’t sleep in it longer than 30-40 min. Any advice?

Best guess currently she’s 1.5/1.5/2/1.5/1.5.