Skip pull-ups and go straight to underwear or commando, try to make it fun by reading books, singing, etc while they are on the potty, let them know accidents are ok when they have one and don’t show your frustrated because it will make them upset and not want to do it. I would take my daughter every 30 mins until she went then once she went I would start the timer back to a hour. We let her watch potty training songs on YouTube and we did do rewards when she went.

Start with when they first wake up
Make up silly songs and dances
Don't force it