You are looking for profiles that have the small orange figure next to the name - which means they are unconnected - so that you can go find prents, grandparents and other ancestors and ty to connect them to someone who is already connected.
Here is one example of an unconnected profile
https://www.wikitree.com/wiki/Taylor-7683
If the profile is orphaned then you must adopt the profile first, then try and connect it, and once it is connected, then you can orphan it again
Once you have made that connection, the orange figure will not disappear immediately - it will only disappear after the next update so there may be a delay of up to 24 hours.
If you have no unconnected profiles on your watchlist, you can try the links from Graeme above in the 2nd answer on this page - they will have an updated list of Kiwi unconnected profiles.