Chopin's etudes after two years? I don't think that's a good idea! I guess some czerny etudes won't do any harm; I especially like Opus 821. They're not tediously long like opus 299 and they cover a wide range of technique. But I don't know your level, so they may be a little difficult for you. What's the hardest piece you've played?
Please, go to "piano sheetmusic" -Czerny (Carl Czerny) - and read the end of that page. There you have a list of Czerny Etudes, from the easier to the harder, elaborated by Bernhard, the great Bernhard. Sometimes I feel that Czerny may be a lost of time. For example, in his Op.299 (School of velocity) the study nr 1 is all with C major scale, up-down-down-up... And I ask: if one needs to practice C maj scale, why not play the Mozart sonate in C Major, much more musical and beautiful?But there are a lot of guys who like Czerny. So, have a look.Best wishesRui