My website was hacked. I backed up what I can safely back up. bluehost

I’m about to purge everything except one problem. I don’t know how. My other sites are secured, so I’m not wanting to purge everything.

I’ve never done this before. I’m on bluehost. I’d just bother them but I don’t want to burden them and also they may not know exactly what they are doing so there could be some issues with their mistakes or misunderstandings.

The site I want to start from scratch is my main site. how do I do purge my site to make sure it’s not infected? I already have whatever I can save downloaded, screenshotted, and copy pasted.

any further words of advice?