I honestly have to say I would do a few more tutorials. The main ones that I would get through are the space shooter, ghost shooter (maybe you already did that one) and the platforming tutorials.
The next thing is go play some games that you like and let them inspire you on what you want to make. Starting with a platformer is a pretty good platform. The tutorials on it will get you up and running on having multiple animations for your sprites, working with different types of objects (Solid, Tiled, etc...) platform behaviors.
You may also want to look at some of the physics tutorials. Basically for me it was a matter of going through about 10 tutorials which really allowed my mind to start thinking about how I would apply some of the techniques and that is what inspired me for what types of games I wanted to make first.