What Visa Options Are Available for Expats Only Visiting Thailand for Two Months a Year?

Presently I have a current retirement visa that expires August 19, 2019. And am permitted to stay until August 19, 2019.

Since 2016, along with my Thai wife and son, we have been residing in the US due to a serious injury suffered there on our annual holiday trip and also cancer treatment.

Because of the necessary medical treatments (I could not walk) and my sons education, we decided to reverse our routine and stayed in the US since late 2016 for ten-months and return to Thailand where I still own a condo, for only two-months each year (2017-2019 so far).

For many years I have been using the income affidavit provided by the US Embassy to renew my retirement visa. That is no longer an option.

I am here in Thailand until July 31 and can put 800,000 THB in my Thai bank but that would not be seasoned for the required two-months prior to the renewal date and because I don’t plan on returning every year and then when I do, only plan to stay here for two-months each year, I don’t know if I should continue to try to keep my retirement visa anymore? If I skip a year, as planned , it will expire anyway.

Are there better options that anyone can think of or recommend?

Thank you in advance for your suggestions.