Jeff noted the method to get an import script written by the core Discourse team (purchase a year-long business plan). If that won’t work for you @FedUpInvisionUser, you might want to post in marketplace instead of support.
To see what importers are already out there, see:
https://github.com/discourse/discourse/tree/master/script/import_scripts
For example, there appears to be a XenForo option @STORMS (I’m assuming that it was XF stands for).
I’ve never run any of the import scripts myself, but there is some basic information about how to run an importer script here:
https://meta.discourse.org/t/vbulletin-import-script-group-forum-mappings/19879