Main Drain’s Covers Don’t Fit on Main Drain’s Hole

[Pablo V.]

Hello. If a main drain hole is a little too big to an 8in cover but way too small for a 10in cover. How could I fix the hole’s size in order to make the 8in fit in properly?

 

[Mdragger88]

I don’t think you can.
Got a pic of this drain?
Edit to add:
There are adapters like this one but it may be trial and error

https://a.co/d/dJkMfWe