1. Use Steam Guard.
2. Make your profile public.
3. Become an active member of the Steam Community.
4. Play games often without cheating.
5. Get praise (commended) by your teammates.
6. Do not kick anyone out of the game.
7. Do not block your teammates and do not harm your teammate in the game.
8. Do more OVERWATCH cases.
9. Like guides like this.
10. Add more friends.
11. Comment on many different profiles, discussions and guides like this one.
I hope this helped you.