404 page not found and its effecting google trawling my site

Hi all,

after moving to a managed service as i kept getting hacked ive moved back to enfold and self hosting.I have had alot of help from a friend who uses enfold alot to make sense and now ive got my two license to do two sites.

Ive finished what i will be doing with one for now and done seo and trying to get it trawled, ive done yoast, submitted site maps etc and verified.

when i checked in securi site checker it will just not scan the site and says page 404 missing. ive no idea how to set this i think i have.I took the caching plug in off.

ive tested in https://httpstatus.io
on https://sitecheck.sucuri.net
and on https://search.google.com/test/mobile-friendly

i did have an issue with :’?avia_forced_reroute=1′. but i think thats gone.
any ideas im a bit of a newbie and novice i would say compared to others here.

any ideas please cheers to get rid of this cheers

sorry if this makes little sense, the written language is not my strong point.