3 year old potty training regression

My child has been incredibly independent with going potty for over a year. They have been out of diapers completely for about 6 months (were still wearing them before while sleeping and when leaving the house) and now they are peeing on the floor 2-3 times per day. It started at twice a week and then turned into once a day and now it's several times per day. They have also pooped their pants twice this past month.

They were having trouble napping for awhile, I thought maybe they were giving up naps so I just allowed them to play in their room if they wouldn't sleep. But their behavior got completely out of hand because they weren't getting enough sleep and they went from being a perfect angel to throwing multiple huge tantrums per day and yelling every time we told them to do something that is routine and normal for us to do at a specific time every day.

We have a very rigid routine. Including scheduled times they are always asked to go potty. This has not changed.

I've thoroughly talked to them about this from every angle imaginable. Every single day. They even clean up their own pee and change their own pants after every accident. So they see the damage it's doing.

I've been forcing them to take naps for about a week now. With kind words and a kind tone but they absolutely must stay in bed and before nap time I always give them a talk about keeping their eyes closed and going to sleep.

For the past week they have been sleeping every day, but not at their usual time. Usually I would put them down at 2 and they would fall asleep quickly and wake up around 4:30. For the past week I've put them down at 2, they've managed to stay awake for a long time and then fall asleep at about 5 and I have to wake them at 6 because they have to eat dinner.

Yesterday I finally got them to fall asleep at about 2:30 which was amazing. The first time in so long they have done this.

I'm at a loss. My perfect child has gone completely out of whack and I don't know what to do. Any advice would be greatly appreciated.