Baby Fighting Naps

My son is 4 months today and we are going through a sleep regression at night. It’s not terrible, he’s waking once around 4, which I can live with. But, he’s started rejecting his daytime naps. He was amazing on his 1.5 hour wake window schedule and would nap for anywhere from 30 minutes to an hour 45. To get him to nap, I would cradle and rock him and he would be amazing, falling asleep within minutes. He’s started to freak out now being cradled. I can’t seem to settle him to sleep any other way. He just screams and won’t fall asleep independently. I’ve tried increasing the wake windows to 1:45, then to 2 hours. Nothing is helping. He is then just going way over his window and staying awake for hours and it’s getting impossible to put him to sleep. Just looking for any advice, recommendations, literally anything because I just don’t know what to do.