Either they made a mistake in October last year or this year in April, or you did get 60 days both times. The visa exempt permission of stay was already 60 days in October last year.
What's your nationality? If you're from the Czech Republic, you should have gotten 60 days in October last year too.
It used to be possible (and quite easy) to get a one-year non-B, but I do not think it is possible any longer.
Not sure what you are asking for. You probably want a one-year extension, as a non-O visa will give you only 90 days. Marriage non-O are known to be a bit of a pain (and of course you need to be married to a Thai citizen). Retirement non-O are much easier, but you would need to be 50 years old at least. Another option is a guardian non-O, but you would need to have a child and pay the tuition fees.
It's not a letter that you're supposed to draft following a template. It's an official document. For the company profile part, there's no official template, but you can ask a language model to write it for you.