Do I need to do 90-day address reports and can I renew my OA e-visa next year in Thailand?

To be completely honest if this is a brand new OA visa, you should have been stamped in for a year when you arrived (or as long as your mandatory health insurance was valid for)

AND

You might notice that PDF of the visa says multiple entries and the visa itself is good for a year from the date it was issued. What that means is IF you exit and reenter the country just before the PDF visa expires (NOT your little red entry stamp) and you had another year of insurance you'd get stamped in for a whole new year <- Most people get TWO years of stay out of an OA visa that is valid for a year by this method.

you do 90 day reporting and your first 90 day report will be due 89 days from the date you stamped in, so if you stamped in on Sept 5th your 90 day report is due Dec 3

you can go to the immigration office and file a 90 day report from 2 weeks before that date to 1 week after it without a fine.