Peter,
As written by Kathie you will need to look at those profiles that appear as DNA connections. What this means is that you need to extend your family tree back to at least great-grandparents. If you happen to have a first cousin on your mother's side that has taken a DNA test and is on Wikitree you will only see a connection if both of you are connected to your common grandparents.
While I see that you have your test at Gedmatch, there seems to be an issue with it. Perhaps you have privacy settings that make it impossible for others to see. I was going to suggest that you look at the One-To_Many - Full Version at Gedmatch - that will give you a list of all of your matches that are also on Wikitree. - the match list will show those with gedcoms as well as those of Wikitree. If there are close connections those are a good place to start. Full Version does require tier one, so you may wish to explore other reports at Gedmatch first.