Deactivate all your plugins and themes
- reactivate the theme and the required plugins of the theme; check if you have no bugs
- if no errors reactivate the other plugins one by one and check if there are no errors.
You can also follow this https://www.wpbeginner.com/wp-tutorials/how-to-find-and-access-wordpress-error-logs-step-by-step/ and share your logs