The way to stop your currect Extension of Stay is to leave Thailand without a Re-Entry Permit. If you do that there is no problem to take your money out of your account.
After you entered with a new visa based on being married you need at least 2 months before application date 400.000 Thb on a Thai Bank account on your name.
For the Extension of Stay based on being over 50 years of age:
800.000 Thb on a Thai bank account in your name for at least 2 months prior application date until 3 months after application date and the rest of the year not less than 400.000 thb.
As you can see, if people use the bank money method, there has to be money on the bank 2 months before application until last day of the 1 year Extension of Stay if you want to apply for a new Extension of Stay a year later.
30 days, 45 days or sometimes due to many people only 7 days but that all depends on what kind of visa you have and at which office of the more than 70 nation wide you like to apply. Without information, I would advice visit your nearest Immigration Office and ask.
I guess you mean you want to enter using the 30 day Visa Exempt Entry, than apply for an 30 day Extension of Stay based on tourisme and than start doing border bouncing to get new stays. Why not make life easy and apply for the correct visa depending on purpose and length of stay before you make your way into Thailand.
An Entry without any visa can only be extended once on basis of tourism.
You mis one step in the story. a Person can not enter using a Visa Exempt Entry and then apply for a 1 year Extension of Stay based on being married. First step is conversion to the Non Immigrant O visa and than the Extension of Stay.
You have a big samp in your passport with the text in line 2:
Extension of Stay permitted up to 30 Jun 2022, BUT as you signed to acknowledge the rules of this Extension of Stay you should know that this has to be cancelled at the Immigration Office if the conditions change, stop going to school is a change in conditions for an approved stay to study in school.
Not sure why you want to apply for a Non O in country? You are not married yet, I guess you are younger than 50 years, does not have Thai children?
Options are: Cancel your Extension of Stay in advance so you have time to travel, visit another country, apply for a Single Entry Tourist Visa and come back to marry your boyfriend. After marriage and you still have time left on your stay, you might be able to convert your stay into a Non Immigrant O visa based on being married with a Thai National.
You did not get 1 month Extension but your application is under consideration and you have to come back at the same Immigation Office on the date mentioned in the stamp, 12 May 2022 and get the rest of the time as applied for.
You are free to go one day early and hope all is set and you get the remaining days, it could be that you will be asked to come back on mentioned date.