Some people grow fuchsias as indoor-only plants, so if it's happy so far it's likely to stay that way. Fuchsias can tolerate (and actually appreciate) lower temperatures than, say, hibiscus or orchids, so if it gets a little cooler inside (say, into the 50s at night) they'll probably thrive. Just keep it out of drafts.

I would say to stop fertilizing it, keep it a little on the dry side, and don't bump up the light. If it decides to rest, fine. If not, enjoy it!

Let it go dormant, cut back all foliage twigs, keep it in the coolest place you can over winter (i.e. closest to 40 F.) and water very infrequently.