If I was setting a goal to write blog posts it would be 1 a week for a year knowing I might write 2 some weeks and skip a week so about 50 a year.
At that rate I’d say I’d have something worth saying most of the time but somebody would accuse some of the articles of being filler and they’d be right, at least sometimes.
If you were going to write 1000 blog posts in a year that is about 3 posts a day, even if it your full time job that’s not a lot of time to research it, think about it, write it, edit it, think about it some more, revise it, etc.
If I had the goal of writing 1000 blog posts in a shorter time than that I’d be look to automation for help.