Adding to Brian's comment, if you use hashtags, please avoid spamming them. First and the main reason, because it's spammy. And second, too many hashtags cause visual noise.
And if you're still looking for an instance, maybe pick some mid-sized Mastodon instance (plus it has good Peertube compatibility). Would advise, however, to avoid creating an account on Mastodon Social as it eclipses the other instances, risking to defeat decentralization. You could also pick a Friendica or Mbin instance as both support microblogging and threads.