There is no automated way of doing this, however, you may be able to narrow down all live workflows using your list.
however, I would start by:
1. search in a workflow view all workflows using your list as such, add the filter where status is `Started` or last executed in the last week or month.

Then you can try identifying the names in your list columns and search those in the data/xml of the workflow also, such as below
1. would be the field belonging to your list,
2. would be where those fields are utilized

Once you have identified all your field names, you can add them as criteria in your initial query, however, searching for specific strings in the memo data across alot of workflows can be very time consuming. try to identify recent modified workflows in the last month using your list and then take the time to identify which fields are being used manually, then remove them from your list, if any workflows fail that are using your list, its because you removed a field that was referenced by a live workflow.