What’s wrong with Misskey? Misskey is well supported, even have proper funding from booth communities and various company.
There are several Misskey apps that works properly, even with Misskey-flavored Markdown support, like Miria and Aria (Miria fork).
Sharkey also has MFM support, so Miria/Aria as main client is better.
Hashtags doesn’t have universal thing.
For example, hashtag for #red can mean anything, from a mere color to political association.
Twitter trending tag often filled with two trending topic that shares same hashtag hut nothing do to with each other. Especially for same langauge but different region like English America vs English Asia.
That’s why Misskey is desperately need English contributor.
It’s always hard for FOSS software when its main community is non-English got forked and international community doesn’t help them.