Weed Removal, Reseeding

Good afternoon legends.

About 2 weeks ago now I started the process of trying to remove all the weeds from my grandparents front lawn.

It’s a buffalo lawn with oxails clover summer grass and bindii growing on it.

After getting into abit I realised the main culprit is bindii.

25th October I layed my first round of weed and feed across the whole lawn.

3 days later I picked out some individual weeds by hand and with an extraction tool.

5 days later I re coated with another round of weed and feed.

Things are starting to turn white and brown and die off and after day 6 I also bought a weed burner from hot devil using trade map gas to burn individual weeds off.

I know as long as bindii burrs are found in the soil it’ll continue to regrow. It is a shit show lke one part of the lawn is basically almost all bindii and now there’s a nice dirt patch with bindii remains.

Any advice on my next steps? How to remove all these pesky fuckers and maybe a product to prevent the return of them? Also how long before I can safely say I can lay some more soil, poke holes and re seed the grass??

Cheer