The best answer of all. Get a coach. be it a professional shotting coach, an experinced shooter who like to teach or train,
myslef for example. I can have you shooting well in about 2 hours. if you listen. Most good coaches can.
Well being putting good groups on paper at 10- 25 feet. While not impressive distances FUNDAMENTALS are the best place to start. Just like golf, you get the short putt right before you start making longer putts.