Your lack of enthusiasm will be apparent to anyone you will want to raise money from. So, that is probably not a viable option.

I think the alternative of bringing in a partner who is passionate about what you are doing is a great idea. That sets up smooth transition for you to get out.

This will still take a while the bottom line is you can stay or leave whenever you want to, but as you have already clearly stated the amount you get out of it will depend on how long you want to stick it out. If the additional return you think you will get is worth it, stick around and make something happen. If not, cash out and move.