I see you have the GEDmatch ID on your profile, so the next thing to do is to search for anyone who is descendent of one of your reasonably close ancestors and has been tested and see if they have or would be willing to have their results available on GEDmatch. This will let you find out if they do have a match with you. Personally, I've got tons of matches on GEDmatch, several of which I have in family tree, but i don't have any who have joined WikiTree. But you may have better luck. And some of the ones I know connect I could enter into WikiTree, but I want to make sure I have their permission before doing so. So you might want to try the invite known matches to WikiTree.