First, I wouldn't worry about your arsenal. For your next league session, pick your favorite, most comfortable 2-3 bowling balls and just take those. Having options is great, but sometimes having too many gets you thinking about equipment changes instead of realizing a mechanical flaw.
Next, everybody has one or two things they really struggle with. For me, a big one is staying down at the line. The other is my hand position in my swing and keeping my hand behind the ball. So, figure out what your sticking points are, and focus on doing those correct.
Earlier this year I went a good 5 weeks without even a 200 game, saw my average drop from 204 to 190. I finally figured out that because I wasn't staying down, I wasn't finishing strong enough and my shots were all over the place. I worked on my finish and my average has started to climb back up again.
Last thing is to try to keep the frustration level to a minimum, especially when you make those first couple of bad shots. I've always found it's easier to rebound from a bad break if you keep a level head and not over-analyze what went wrong
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It IS next year!