Style or Styles?

I tried to find something like this., If this has been asked before feel free to delete. Oh, and sorry if I look like a huge noob ;_; ^___^

So, as some people may know, or could have guessed, I am extremely new to lolita. So far, I have like, 2 JSKs, a blouse and a petticoat (which I'm soon to be modifying to make poofier ^^). However, the pieces I have now could probably be called more 'Classic'. That's fine,  like it, but I really love Sweet lolita, and Gothic lolita interests me too.

My question is, do you keep to one style which you change slightly, e.g. mostly sweet but add classic hints, or mostly Gothic but add punk or sailor hints. OR, do you, or do you feel it okay, to wear OTT sweet one day, then something like ero or gothic the next?