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.

https://homeguides.sfgate.com/fastest-way-kill-fleas-yard-permanently-53588.html

It will take a full month of diligent cleaning, so be prepared!

Here's what one Hometalker recommends

https://www.hometalk.com/13368995/homemade-flea-repellent-for-home

Homemade Flea Repellent for Home

We had a terrible flea problem and tried everything. This is the stuff that finally worked! https://amzn.to/33vUkTS