I think you need to work on making more friends and allies, and don't avoid the Sunday Skirmish!
Don't expect people to invite you to pilot for their team if you have no practice with the crew, it's amazing how competitive Sunday skirmish can get.
Initialise convocations with your higher level comp player friends, ask if they have too many substitutes available to join or make a team!
Put a post up if you want to make your own team:
https://gunsoficarus.com/community/forum/index.php/board,9.0.htmlAnd do so in advance so the people who apply have time to practice with you!
And lastly: Stalk your role models, join matches, ask for passwords and be the one to take the initiative in convocation.
404's Cakes and Gents often fill up lobbies so make friends and stalk.