Hi I obtained a DTV a year ago with the 500 000 baht in a bank account plus other finances . Can I put this towards buying a condo ?

Hello, I need advice regarding long-term stay in Thailand. I'm from the Czech Republic (. Europe) and plan to spend at least 5 months annually in Thailand, where I'd like to purchase a condo. I want to stay 5 months in Thailand and the rest of the year traveling in Asia (Malaysia, Cambodia, Laos, etc.), with Thailand as my main base. I'm not over 50, don't have a wife in Thailand, and Elite visas are too costly for me. 😊 How can I legally secure this stay without frequent trips back to the Czech Republic? Thank you for any advice and experiences.