After you resolve your tethering challenge, the next step will be to practice compositions, that you haven't really tried yet.

Is there anything new you haven't done or you don't feel much comfortable with? Such as Golden Spiral, Diagonal method or Dynamic Symmetry? 

Block some time to practice the compositions you are not much familiar with, it will help you grow your skills more. 

Final image is a result of applying multiple composition techniques. It's like building a house - first, you apply base, then you build walls, then you build the first floor and a roof. This is the same with building a scene - you apply composition first, but then, on top, you apply other techniques.

To list you some, we can mention: rule of odds - you work with the odd number of objects, dynamic tension - your objects face different directions, leading line - objects create invisible line that leads the viewer to the main subject, framing - you use other object to frame your main subject, or negative space - that helps you bring more attention to the main subject. 

What helps us to learn more and progress is getting out of our comfort zone. Create a mood board, where you include various images that inspire you. Observe how they are created, what could be the composition the author applied, how the main subject is positioned, and where are other supporting elements. 

Read those images in detail and try to recreate them. You will need to copy them in order to get into the mind of the author and understand why he/she did certain styling decisions. This will grow your skills significantly.