Garden center people have no business selling bonsai... drives me batty how they set people up to fail...
Not a bad looking tree... if the soil is draining well I would hold off on repotting it unless you have ideal conditions to keep it in afterwards... Unless there is no frost danger in mid-February... it's just as good to wait until you are sure no freezes will happen, especially if the tree has been indoors most of the winter... you'll just tick it off.
Worst thing that will happen with it staying indoors for the balance of your cold season, is that it'll kick off it's leaves in the spring since they will be too tender to handle the UV rays of the sun... when it regrows them they will be waxy which is it's natural defense from sunburn.
La belle cose prendono tempo... (Beautiful things take time...)