Hey there! Welcome to the Hive bedrock forums! Before making a suggestion, I recommend reading this post. It outlines some fundamental guidelines regarding making a suggestion 
Unfortunately skill-based matchmaking / a ranked gamemode has been suggested before. You can use the search feature (
) to look for the suggestion beforehand to ensure you do not make a duplicate.
You can find the original suggestions here:
SkyWars ranked gamemode
Treasure Wars ranked gamemode
Skill-based Matchmaking