help!
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I have/had a website created with concrete5. I left it alone for too long and Concrete5 upgraded and the theme I was using is no longer compatible, so now all you see is latin on Elemental (default).Anyone have experience with fixing this problem? Do I have to start all over again?
I found an archived version of your site from June 12, 2016.
https://web.archive.org/web/20160612203214/http://avianaid.org/...
The archived version is using 5.7.3.1 and the current version of your site is 5.7.5.8. The theme you were using was Equinox, which should be compatible with 5.7.5.8.
As far as I know, concrete5 will not auto-update itself. Most likely you installed concrete5 using a web app installer like Softaculous (which may be set to auto-update). Your site looks like it was partially reset, not updated, so some part of the web app installer process may have broken.
I would contact your web host to see if they have any backups available. If no backups are available, you could reapply the Equinox theme and rebuild your site using the archived version to copy and paste content.