@SukhK@786 literally, work experience can fill in as a GAP but it would be more of an appropriate sense if you continue to work and if you've already stop working just try to look for a new job don't stay idle except you have any second(personal) idea..
A GAP could stand for any post secondary activities before deciding to further your studies again
You need to explain the activities of your 6yrs work experience of your post secondary as a gap in your studies when writing your SOP(try to be honest at least)