Maybe instead of taking a long break,look for long-term investments but still check in every so often. If you want good merchanting advice try www.rune-tips.net , sign up for the forums and post a thread asking for investments.
I'd recommed investing in treasure trail rewards and gnome minigame items if you can get your hands on them. Specifically top hat, croziers/vestment set, pods, goggles, mints (if you're good or lucky enough to snipe a couple in GE). There are plenty of smaller items that will rise significantly in the next year