the cadenza stuff seems to have the same importance as the melodious parts. i'd soften the cadenza-like stuff - and make it like frosting on a cake. really bringing out the parts that are basic. maybe highlight them in yellow. give them extra attention - and then the friviolous stuff will become more important too, by showing where it places in all of this. it's like telling people where to stand. noone is less important - but some will be higher - some lower...some softer...some louder.
also, more seriousness (and also slowness) for the melody parts and speed for the extraneous stuff. if you carry the frivolousness of the faster parts intothe slow - it makes it all sound frivolous.
i'd like to hear no staccato on the chord next to last. just ba ba. two strong chords of equal length. but, i have no idea if a staccato is written in.