Dota Underlords is still in the throes of Early Access, which means some major gameplay functions are subject to change. In the next update, that means a complete overhaul for the ranked system that should make progression clearer. Valve’s noted plans to build a more visible rank progression for some time now, but the developers have gone in depth to explain what’s changing.
You’ll now have two separate queues for ranked and casual matchmaking. Casual will try to match you with opponents of equal skill, but will drop the pressure of affecting your rankings. You can enter the casual queue solo or with friends, and you can still complete daily challenges and achievements there. Valve says this mode is intended to let “you experiment with new builds, or complete those elusive challenges.”
Ranked will force you to queue solo, and will matchmake you based on your current rank. (Of course, you can get achievements and dailies here, too.) New accounts will have to play five matches before entering ranked, but existing players will have immediate access when the update goes live.
Original source: https://www.pcgamesn.com/dota-underlords/ranked-system