When creating or editing a CiviRule, not all custom fields are available in Condition Parameters
You probably need to file an issue on the Github page, and hope for technical guidance on how to solve it there.

However, I could think of a hack...

You could take one custom field before 92 that you are not using (or not using for CiviRules), and swap the id directly in the SQL-database. In that way you will probably see your custom field in the list.