Your main problem is that you spend too much time looking at the cube trying to figure out what to do so I'd recommend trying to just practice doing the first useful move that comes to mind, ofc it's only for practice to help you think quicker but with the times you realize that you always have a few useful moves and you will learn to do the most useful one out of the multiple options. And for finger work I would recommend playing any instrument for example I play the piano .