Why not try a nuzlocke run of alpha sapphire to make it more interesting? I haven't done a nuzlocke of oras yet, but I remember emerald being a real challenge.

If you really can't decide, and don't have any qualms with restarting, may as well start over with something new.

Nuzlocke is definitely an option.

Another option is to do a "huge team" run. (Or so I call it.)

Remember that "catch everything as you go" thing most of us probably did when we were new to Pokemon? Remember how grindy that was? Well, imagine that without the grinding. That is a huge team run.

The rules are:
1) You must catch at least one of everything you see. (If you don't see it, no need to catch it.)
2) You can only use your 15 lowest level Pokemon.
3) You cannot specifically seek out wilderness encounters for training.

In a huge team run, almost everything you fight will naturally be about twice your level. That means the further into the game you get, the more difficult it becomes.

This type of gameplay forces you consider a lot of strategies and Pokemon setups; you have to switch your team up a lot, and think hard about movesets before going into a new area, or you will be completely annihilated.