Can I reassign my 500K THB now that my Thai visa is approved, or do I need to keep it in my account until I arrive?

If you need to touch that money, you likely don’t have enough

Thank You for your helpful report 👍

Congratulations 👏👏👏

PRINT OUT THE EMAIL THAT HAS YOUR DTV VISA.

That's what you should do... print it out.

You may have to show PROOF of your DTV Visa to airline staff on check-in for your flight ✈️ to Thailand...even to the connecting airline staff. Or to the land border crossing entry Thai Immigration Officer.

Upon arrival into Thailand, show the DTV visa to the Thai Immigration Officer and look at the STAMP placed in your passport to be sure you are STAMPED in for 180 days.

There is no obligation to keep the funds in the account unless you plan to apply for an in country extension. I suggest you print your visa and show when you arrive, and don't forget your DTAC