When you reach your experience trophy level 50 you can play Ranked matches. I suggest you first you check your new account at dotabuff and then see if you encounter any discrepancy? So there are some examples which I will give first, then I will explain it based on those examples. Farming is extremely necessary in Dota 2 even if you are a carry or just an offlane support. You can vice-versa yourself. Dota 2 uses standard techniques to quantify and track player skill.
So for Carry players high kills and low deaths will determine it as a good KDA but for Support player, high assists and low death will be considered as good KDA.
Dota 2 Ranking System (MMR, Ranks, & Leagues)
It will be clear to you once you read official information. But I also said that have minimum possible deaths. Keep it as high as possible in ALL of your matches by having good number of assists and low death counts and you will see you will get starting MMR. The main goal of automatic matchmaking in Dota 2 is for players to enjoy the game. In case you are planning to cleanup your PC or your Something like you play more games but its showing less games in dotabuff.