Your name and username are the only things IG uses in search queries - so what you add under “name” will show up in results, not in “bio”.
For example, if your name is John Smith and your page is on fur coats - enter your name as “John Smith Fur Coats” rather than put fur coats in the actual bio.
If it’s a slave account, you can @main in the bio - although unsure if doing this too many times will lead to a ban.
Using appropriate emojis alongside skills, keywords, and values of the account and target audience will give it a tidy look.
Finally, some influencers or repost pages advertise their branded hashtag here.