How to remove friend suggestions on a secret account?

I made a spam account where I want to post things I don’t want to post on my main where all my acquaintances are, and ofc I turned off contact syncing, but I still get suggested people I know in real life. is there any way to clear these suggestions? I think it may be coming from the fact that i’m signed in on my phone, which has access to my main account too. I do not follow my main account on my secret one, or anyone else I know.