It's all about your advertising man. Promote yourself around, join art discord servers just to post your comms and then lurk a little before dipping if you choose.
Pander your regular non comm art a bit, like fan arts, so more people come in and see your comm sheet.
If you post on Twitter, look out for those "artist chain threads" that appear here and there and participate in those. Commission themed thread or not.
Fiverr and DA have their own tips and tricks (like with Fiverr, ever want to be successful? You have to get some friends to buy and leave you good reviews to start).
In the end it's all about how much you promote yourself and how many eyes you can get going to your page. Pander, do art raffles ("followers only"), etc etc.
And don't let yourself be scared by how other people succeed. Instead try and learn why they're doing good and figure that out so you can see if their methods work for you.