Hey Casper, this can be really frustrating for sure but you will come out of it. I would say it seems like your doing lots of hard work in practice and working on the shots but maybe now need to work on how to actually use these things in matches and focus time on just being match smart and understanding your game better and what works for you. I would write down what you feel are your strengths and best shots, also what style you enjoy playing and things you find fun. Then try to do the same with your weaknesses and areas your not as strong at. Then try to build a game around these things and get the cooch to spend time working on how to get your strengths into the game play more and more often.
For example of your forehand topspin is your strength then try to find serves which allow you to set up this shot and use it more. I would also say do lots of match type drills now in practice and even if it’s a normal footwork drill, score the points to make it competitive!
Give this a go ad let us know how you get one! Tom 🙂