CSS not linked and images not being display across all site

I’ve installed and tweaked a bunch of plug-ins templates.
The results are not as I had intended.
> the CSS is not being applied to Blog pages (admin is mostly fine*).
> no images are being displayed
> *In the theme admin panel, there are no images or previews available.

So far to fix it , I have:
– turned off and un-installed all plug-ins
– set permissions on the wp_content directories (and subs) to 755
– checked for the paths in the html.

Finally, to try start again from scratch
– I uninstalled(in part) WP on the site, cleared out the database
– reinstalled WP.

Any thoughts? or ideas on what could be wrong or how I might fix it?

my URL is https://www.adventuretemples.com

Thank you in advance