Take pets to be dipped. While out of house set off flea bombs, spray yard and get the pills from vets that kill fleas. Repeat in 2 weeks to get the eggs. I did this, been flea free now for 16 years.
It will take a full month of diligent cleaning, so be prepared!
Here's what one Hometalker recommends
We had a terrible flea problem and tried everything. This is the stuff that finally worked! https://amzn.to/33vUkTS