@ampli: Usually all you need to do is deactivate and then reactivate any plugins that don’t see the new path. Worst case, deactivate and delete the plugin and then reinstall it.
@suzettefranck said
Maybe the easiest thing would be to use this plugin and reimport your db to your new host,
No need to do that, and all that will do is bring the old path with the database, anyway.
Any plugins that are not seeing the new path – like backup plugins – need to be deactivated and reactivated, and then they will see the new path. You may have to deactivate and delete the plugin and effectively reinstall it. But they will pick up the new path.
I would try to search the db for the old path and replace with the new path, but that could cause problems.
And that will cause issues, because a simple find/replace in a database dump will break serialized data, such as used by themes and plugins.