Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate

After updating the version of WordPress on my website manually (the other way wouldn’t work) I’ve been battling this issue nonstop:

“Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 122880 bytes)”

First I tried wiping everything and starting over from scratch … I was fine yesterday, but today the error is back. Everything looks fine on the surface (I can browse it as a guest fine), the issue just shows up when I try to access any of my admin features.

I’ve tried following the advice from other threads …
1. “In your site’s .htaccess (being a WordPress blog, I’m assuming there is one), enter the following line
SetEnv PHPRC /<unix path to the directory where php.ini is>/
(keep the slashes)” … this solution just kicked me back to my server host … didn’t help at all
2. “Edit wp-config.php and enter the following line
define(‘WP_MEMORY_LIMIT’, ’64M’);” … didn’t work
3. edit the .htaccess (tried tons of different codes I found on the forms in that thing, but to no avail)
4. create and edit a php.ini file using the code from here (https://pastebin.com/D4xB3iJY) and editing it with info from my website (https://lhancock.us/info.php)

None of these ideas/suggestions changed anything!

Thanks for your help!