Well I'm in the process of ship collecting. Buy all of the ships in the game and fully outfit them. Just because you have the biggest ship doesn't mean its the most fun or the most effective at everything. I enjoy having a variety of ships to take out. You can help other commanders, get involved in powerplay, fly out to Sag A, Interdict poor souls who cross your gaze, join the gang of space racers who speed race around stations, hunt down notorious commanders, bounty hunt in RES or combat zones, do Bulletin Board missions, try mining, do actual trading, join an online group for Elite (there are quite a few, and you can even find some on this forum - there's an entire section for it - Getting involved with the community for this game can really help bring you out of that isolated boredom state), or any number of other things.
If you really want, just take a break from the game for a week. If you don't get the urge to come back, then it's not worth your time anyway. Anyone who truly enjoys this game will want to come back to it if they spend too much time away from it.