I just go to the earliest ancestor in a family line, click on descendants and begin to fill in those still waiting for spouses. I always go "no children" "no spouse" where appropriate as this fills gaps in the descent line.
Then I open Wikitree in a separate tab, open a name search & check places for likely connections or merges.
Then, going back to the name search box at the top of each profile, press enter on the empty box, you'll get a search field asking for more detail, look for the "text search" at the bottom of the page and enter a small locality such as a county or town and see who else Wikitree has living there.
I also make an internet name search for an individual who may turn up in an online genealogy, newspaper extract or local history. Then track sources for that person & if the fit is right via parents etc. - bingo!
Remember to use the specific google search engine for each country as this brings up better results - for searching in Ireland use google.ie, google Australia in google.com.au - England is google.com.uk - New Zealand google.co.nz etc.