This is what your post says to those of us who want to help: You're currently managing a team, you're doing well possession wise and having a lot of shots(However as you've posted no screenshots at all to help us assess the situation we can't help) You've got good coaches(which isn't going to affect creating good chances in the short-term) and you have tried lots of strikers(again without any screenshots of these strikers)
We need screen shots of your formation, your team instructions, information on player instructions, screenshots of the match stats for these games where you're not scoring goals and screenshots of the strikers you've been using in order to help in any way.