Where are you fishing? If you are fishing from a pier, you are limited to certain casting styles, since there are space limitations.
What helped me was:
1. Finding sweet spots for each of the rods that I use (sinker weights). I actually had to tie a 30lb braid shock leader to one of the reels spooled with mono, because the main line was breaking when I was casting really hard.
2. As FishingKid said, there's still room to play around with techniques even with just overhead casting.
3. Switching to Conventional (SQL15 non-levelwind), although that may not be an option for you.
I don't think it's worth changing the line just to get more distance, since you want to use the line for intended target.
I do 2pm (Starting) -> 9am (Swing back, then change direction right away) -> 1pm (Release point). It helped me, but I am not good enough to keep the accuracy. It sometimes goes to the right side of intended target point. But swinging back and changing direction stores more energy on the rod.
Are you doing something like this? (Image from Google search)
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