Step 1. Jump in a secluded location and get gear.

Step 2. Grab a car, drive to the center of the circle, run into a house, sit there, and wait. Replace step "grab a car" with "run" if needed, and replace step "run into a house" with "prone in the grass" if needed. Repeat this step until there's few people left in the game, or no cover remaining.

Step 3. Kill everyone remaining.

That's the highest winrate strat.