Can't access vBulletin anymore

today i tried to access my vbulletin-run website

can’t access

turns out my fees were overdue

so I paid

website still doesn’t work

seems the .htaccess file is missing.

what steps should I take to return my website working the way it was?

See if the .htaccess file was just renamed. If not, dig it out of your backups, or queue up a restore from the panel to restore to a timestamped directory and leave your main site alone. Then copy the .htaccess file over.