800k in your account for 2 monts. .don't go below 800 in the 2 months. Get sim and home wifi for 599 or 699 baht a month with annual contract (you will need both). Very cheap at TRUE. this way you will have a fixed Thai number and fast internet all year. Sim is 20GB and you can easy add more GB through the TRUE app from your phone if and when needed.
Get a copy of the TM30 and take it to immigration. I would suggest you start the extension 1 yr visa immediately after to have the 900k in the bank account for 2 months, to avoid any issues and you will have the extra time in hand In case you need it. I am also at the same stage as you. Been 1 month with my 880k in account, but I am looking for a good lease for 1 year. Low season and too many options. I would also suggest you pay the extra 4k and get the multi entry so you can travel outside Thailand without too much trouble. Cheers.