Step 1. Learn how to ELO.

Step 2. Work out the retarded number of wins you'll need to get daily without any losses to hit #1.

Step 3. Do it.

Chasing rank 1 on any popular mod is pretty daft, far too many people playing constantly causing the ranks to shift about. You have to be stupidly good + spend your life doing nothing but playing that mod to get there & keep it.