Dear Larapool,
to answer your question, I must ask you something: are you satisfied with the results you achieved so far? Is your teacher satisfied as well? If both answers are yes - and I'll assume they are - you are just fine. Then, the idea of going back is not for you.
Nevertheless, the repertoire is wide, and the pieces you want to play have many different levels of complexity (in other words, some are easy now, some are impossible). The coolest idea is to make a list of what you really want to play, and then - with some help by your teacher - organize that to have a well balanced choice of works.
For instance, after the sonatas you played, it is time to tackle a first movement in sonata form with greater dimensions. Let's say, Beethoven's opus 02 number 1. But let me suppose you love the first sonatina by Beethoven, in G major. It is becoming quite easy to you by now: why not playing it as well?
Another example is Bach. From the point you are, there are many possibilities, but a simpler fugue from WTC could be nice, or a couple of dances from a suite (an allemande-courante pair, for instance). In the same fashion, the minuets from Anna Magdalena's Notebook are piece of cake. Why don't you play a pair of them?
Notice that a teacher's help is mandatory to guide your choices, but a hint may be useful: a challenge (this Beethoven's first movement, or Bach's fugue) will take months to be proper done, will have passages that you will strugle with. The idea, btw, is that: the piece must have aspects to push you further. These other pieces (the easy ones) are something that will be done after a week or ten days. That is, they will not present major problems - or no problem at all - but are nice repertoire to play.
Finally, a balanced repertoire is usually made of easy and more challenging works, pieces that you play for years and pieces that you are just trying, and so on.
Best regards,
Jay.