Get some qualified coaching.
In a league there are no shortage of people who want to help, but haven't the first clue as to how to go about it. Some very good bowlers are not good teachers, and some average bowlers are very good at teaching.
Great teachers will try to add to what you already do well, and help you without a "total overhaul" of your game (unless, of course, you need one). They can take a complex idea and have it make sense to you.
We are all different. We all develop our own style, but if you can repeat shots you can find a way to score.