This is killing my account. Tiktok won't let me use more than 5 hashtags.

I know many people recommend to use only 5 hashtags, but it's not the reality for my content (niche 3ds cute videos). And I've been doing pretty good before this, but now my account is plummeting. I barely get any views, went from 500likes average to less than 50. This feels so unfair. Once I reached an audience TikTok punishes me like this.