I have done it all maining non-meta (aka new squiffer), and meta and have to admit the best thing you can poasibly do is not have a main
I do have a list of "main" weapons, however these are weapons I love to mess around with more than focus on being the best with. Due to this I have all sorts of weapons and done fairly well with all them (except the googla duelies tbh)
In my solo queue and league career I have used tentabrella in RM, flingza in SZ, goo tube in almost everymode, I even went S to S+ in clam blitz using the CE-liter.
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Understanding each teaches you something about yourself and helps you see where you need to improve....without a "main" view getting in the way of making better decisions.
So If are playing the game and truly desire to get better than don't ever limit yourself, not now not ever.
"Jack of all trades, master of none, though it is still better than a master of one"