How to improve your competitive matchmaking trust factor in CS:GO.

-Review as many overwatch cases as you can.
-Ask friends to commend you in-game (join a deathmatch or something). Don't buy commends from a bot.
-Don't lobby with cheaters, when they get banned your wins are also adjusted and it also affects your trust factor.
-Don't lobby with low trust factor players.
-Don't votekick teammates unnecessarily.
-Remove Vac/Overwatch banned players from your friends list.
-Don't spam reports i.e. reporting anyone who is better than you, first be sure if they are cheating, then report.
-Don't troll or attack teammates forcing them to report you.(unless you are a russian of-course, i know you cant help it. xD)
-and Lastly but most importantly, DON'T ♥♥♥♥♥♥♥ CHEAT.

Disclaimer: Valve hasn't officially disclosed any of the elements that affect your trust factor, these are just from my personal experience. This guide doesn't guarantee improving your trust factor, it may or may not work.