4.5 month need help!

I am hoping to clean up a schedule for my daughter a bit. She is 4.5 months and I’d been doing just 2 hr wake windows, asleep around 7p (her sweet spot). I haven’t done much sleep training since she is in my room still and her nursery is a little farther away than I’d like to leave her alone all night, but she does nap in her nursery. What is a good schedule to start? She was napping 90-120 mins well but is now waking at 40-45 mins so I think I need to adjust. I haven’t had a baby in almost 6 years so I just can’t remember.