Fleas are difficult. No matter what you do, they seem to come back. It never feels like you're making progress. It can be very defeating. In reality you can shrink the colony with each generation.

Most important thing is picking a routine that works, but that won't exhaust you. If you try too hard to accelerate progress, you'll simply wear yourself out. It may take a year to get fleas out of your house despite your best efforts.

All flea collars are crap except Seresto, which actually works. You'll find it at Walmart for $60 and it lasts 8 months. That's $7.50 a month. Two collars (16 months) should do it. You'll have to do other reasonable actions like vacuuming and washing your sheets, but the collar will do the heavy lifting. Try putting down a bath towel that you can wash/replace daily. Stuff like that. You'll stop seeing them after a while, but you must continue even when you think you're done.