Hi Lana,
Thanks for your confirmation on this! This sounds like a plugin or theme conflict: in this case, to get started, I would recommend you to enable WP_DEBUG and WP_DEBUG_LOG and share with us any messages you see while accessing your Dashboard. All WP_DEBUG messages will be stored in a debug.log file in /wp-content.
After that, if you find a specific error associated with one of your plugins or theme, you can disable it and check if the problem is solved.
Let me know if you have any other questions in the meantime and I’ll be happy to assist!
Best Regards,
Patricia