If you made a backup like you said you did, the easiest thing is to spin up a new droplet, follow Move a Discourse site to another VPS with rsync (but do not copy the database files), and then restore your backup.
If you made a backup like you said you did, the easiest thing is to spin up a new droplet, follow Move a Discourse site to another VPS with rsync (but do not copy the database files), and then restore your backup.