What to do with old site links in Google Search Console?

Question

Search Engine Optimization

Good afternoon!
Please advise what to do with a very unpleasant situation.
Background:
I purchased a domain on which there used to be a marketing agency.
I made a site of the same subject - very simply about the company and services on 7 pages.
Yandex indexed everything. Didn't find any specific bugs. Everything is ok here.
But Google found some old garbage pages of my site in the amount of just over 3000 pieces. The topic of these pages is complete nonsense - how to remove warts and pimples, garbage in short.
When you go to these addresses, my site, of course, gives a 404 error.
Google Search Console included all links in the excluded pages. The current pages are not indexed by Google.
Tell me, please, what to do with this "good legacy"?

Answer 1

I would check the robots.txt and sitemaps files. If these links are still there, then delete them.

Answer 2

301 redirect to all non-existent pages of the site - will throw on the main or top-level page

Answer 3

If in the future the site will be very difficult to move forward, I would advise you to change the domain. There is a high chance that it was filtered, for good reason the previous owner did not renew it.