Maybe you can pick different elements from the thema to vary in different variations, e.g. melodic/motivic content (descending third), harmonic, rhythmic(iambic), the sixteenth note flushing, etc. I remember in Beethoven's Diabelli Variation, he picked the openimg turn figure, the G-C upward fourth bassline, E-F-A melody, the monotomous repeated chords, harmonic content, melodic contour etc to develop in each of the variations, rather than having all the elements appear in different variations to make it recognizable. The elements are cut, transformed and transfigured throughout the piece.
Yes I feel like at the beginning it freely develops, but later on there is some progress making. I have to re-listen that echo once more, since I could not recognize that in my first listening.
I nearly give up the piece since I think I don't have the skill and motivation to finish that. Unfortuantely I didn't have time to look up to the same score. Even though it took me 6 years to finish it, the time on real composing is much less since I can only compose in rare free time in weekend. But that definitely helps purifying the content. It helps me plan every detail of the piece and make it as flowing and reasonable as possible.
Yeah because I want you to know how much I appreciate your work asap! I admire your quick progress and skills! Great Job!