qoto is an instance for STEM professionals, but not necessarily just STEM content.
I'm retired so my interests are not just science and tech anymore, so maybe I tend to toot stuff that's all over the place. I try to tie it into science/tech whenever possible, though, like my #/caturday toot today and last Saturday.
Re the political stuff, there are folks here who are all over the spectrum, so if you want to discuss/debate issues/philosophies, you're sure to find people who like to do that.
Looking over your toots, I think you're fine and they have a nice balance. I notice that new folks tend to do more boosting, which makes sense because they're still getting a feel for things prior to putting out a bunch of their own content.
I hope you enjoy qoto and make it your Mastodon home.