Skill-based Matchmaking is mandatory for better player experience.

I think ranking should be based on : KDA + number of win + survival time ( or placement)

Something like this:

1 win : 500 points

KDA: 10 points for every 0.1 . Kda below 1 will be counted as 1

Placement ( survival time): top 2 is 200 pts, top 3 is 175 , lowest placement to have point is top 10: 100 pt

So, for a person with 2 wins, KDA: 3.0 , and total  2 times top 2, 4 times top 3

Ranking points = 1000 + 300 + 400 + 700 = 2400

A person with 0 win, KDA: 7, total 6 times top 3

Ranking pts = 0 + 700 +  1050 = 1750

And the ranking points should be reset every new season to prevent point accumulating.