i think lots of people have that same ‘problem’. i am doing electronic music for i think 3 years, and only recently got around to working on the same track the second day. i even worked on one track for maybe a full week! if all is well, i’ll actually finish the track. most of the time i’ll get tired of it, or my head is in a different mood, so i decide to start afresh. i don’t worry about it too much. i just have a folder named ‘sketch’, in which all of the sketches go, and a folder for songs that i am enthousiastic about and want to continue. once in a while i go through both folders, listen to whatever i got, insert three notes here, add an effect there, and generally don’t change much . when i really think something was bullshit i delete the file. and sometimes a sketch gets me enthusiastic and i make it into a bigger song, and it gets its own folder.
my best tip: don’t worry about it too much. go with the flow, be patient.