We have a page listing the profiles of notable people who are not (yet) connected to the main tree here on WikiTree. The default sort on that page places 5-star profiles at the top, and then other notables (in descending order by branch size, then in alphabetical order by country, then in alphabetical order by Last Name At Birth), although you can sort the list by any column by clicking on the icon next to the column header.
If you scroll down the list, you may notice that about half the page is taken up by profiles with a Branch Size of 1. In other words, those notables don't have any relatives linked to them on WikiTree: no parents, no siblings, no spouses (spice?), and no children.
Now, as any connector can tell you, connecting profiles to the main tree can take a lot of work. But if you can add even one family member to any of these unlinked profiles, then you would double the size of their branches, and therefore double the number of ways for other connectors to connect that branch to the main tree.
(That's not to say that adding more family members wouldn't improve the situation even more, because it would. So if you come across a source -- like a census record -- which would enable you to add multiple family members, don't let me stop you.)
So can you add one family member to an unlinked notable?