What visa options do I have for extended stays in Thailand after multiple entries and stamps in my passport?

I have visited Thailand for many years, usually for just 3 weeks at a time. When I retired from work in 2015 I also got a new passport. Since then I have spent 3-4 months every UK winter in Thailand. I have returned to the UK for Christmas and left Thailand on occasions to travel to other Asian countries. I did use 30 days exempt but also 60 days single entry and the old 3 entry’s visa.

I have never overstayed, I am a genuine tourist, no Thai bank account, property, criminal conviction etc.

I had a good job in the UK so have a good pension and savings. Last time I visited Thailand in March this year, after returning there from eight days in Burma (by plane to Chiangmai) I spent two hours with immigration. They clearly didn’t like the number of stamps in my passport, and they told me I must get a visa in my own country next time.

I want to return this year in October for five weeks, then return home for Christmas, then back in January - February time for eight weeks, possibly more.

I’ve spent quite a lot of time reading posts on this forum and others, but advice does vary.

I would just like to get advice as to the best way to do this, so I don’t get refused. Obviously I can’t do the 30 days again.

I would really appreciate any advice anyone can provide.

Thanks