I do various searches to find potential trades.
One of them I will take a random insert in my For Trade list and look for members who have it on their wantlists. Then do trade matching with those members and sometimes that works.
If I want to work on a specific set, I will click on "Members who have cards from this set to trade" pick the ones that have the highest number and trade match those members.
The members who I have listed as "friends" I will periodically run a trade match with them.
There are probably more ways that I've used that I can't think of right now. The nice thing is these searches take a relatively short amount of time. If I'm waiting for my kids to get done with school or at the doctors office, I'm on my phone anyway.
The hardest thing to do is list all of the cards I have for trade. I rarely have a hour to just sit and list cards, I'm sure if I did I would make many more bigger trades.