the 1-year extension started on the day after the 90-days stay permit from the Non-imm-O visa expired. So your next application will happen a week or two before the Extensions expires on July 2, 2025. You should have collected 12 months of consecutive transfers by then
in Thailand you cannot apply for the "1-year extension of stay based on retirement" (the thing people call wrongly "retirement visa") if your enter Thailand on a "365-days Non-Imm-O/A Longstay Visa". You will be forced to sign up with a Thai Private-Health insurance, if you go from the visa to the Extension of Stay out of a Non-Imm-O/A Visa. You should now apply for the 90-days Non-Imm-O RETIREMENT Visa (Non-Imm-O without the "A") in your home country on the e-visa system, enter Thailand, open a bank account, transfer the required 800,000 THB onto it. And as soon as the deposit has seasoned in your account for 2 months, you can apply for the "1-year Extension of Stay based on Retirement" (which is the REAL "retirement visa"!!) There is no health insurance required, no police record check, no medical statement as it would all be required for that Non-Imm-O/A Longstay Visa.
and be aware: when you enter on a Non-Imm-O visa, the opening of a bank account is easy, can be done by yourself, or by an agent for 5000 THB. When you enter on a visa-exempt or tourist visa, you cannot open a bank account any more since February, when banking rules have tightened. Some agents have deals with Immigration to circumvene this, and banks that are willing to cooperate. But this will cost you a sh.... load of dosh
When flying one way on a 60-days tourist visa, or planning to enter visa-exempt and get stamped in for 60 days, be aware that the airline CAN ask you for a proof of onward travel out of Thailand within these 60 days. You can risk to buy a "onwardticket" or better a REAL flight ticket, one-way Air Aisa to Siem Reap is something around 40 USD. Flying one-way on a 90-Days Non-Imm-O Visa, doesn't require this proof, because this visa normally is used to gain a 12-year stay permit inside Thailand
applicants whose embassies don't issue any income affidavits, are allowed to use the 12-month bank statement method for their application. A statement from the bank for 12 consecutive months, for incoming from abroad a minimum of 65,000 THB, uninterrupted, month for month, will suffice. And you need to update the bankbook on the day of application