Thank you for the input, @xrain. I tried posting on r/todayilearned a few weeks ago, but it was bounced back. I’m not sure why

Maybe, because you misspelled words like my nickname (and not for the first time)? 😀

Mushroom groups tend to prefer photos rather than links

Right. Many subs prefer a set of pictures posted on Reddit to a link leading to a Hive post. For example, country subs love travel pictures but often don't want links to travel posts. Some of them just tolerate such links - that means the mods don't upvote your share, means your share doesn't gain traction from them.

Some of subs I shared above are strict and need to be treated scrupulously, with a long-term attitude. Then, they might bring much use.