Lee Sin Gameplay Help Needed

Hello, all! I believe this is where to put this kind of discussion...or whatever...but I was hoping to reach out to any high elo Lee Sins that would be willing to help me, a lowly silver scrub improve my gameplay and choice making. Recently I've been determined to get Mastery 7 on Lee Sin as I find him to currently be one of my most enjoyable and challenging champs. I've had him at Mastery 6 for a while now but I'm finding it extremely tough to even get an S- now all of a sudden. By the way, I know how to ward hop and insec and all of that. Anything else combo wise could be useful but truly it's decision making and other things of the sort that I'm having trouble with. Any help is great! Thank you!