Build yourself. You are motivated. You cant ask someone to be motivated about your "thing" unless you are paying them. Otherwise it should become a "we" thing.
Yes, either build it yourself, or successfully share your vision of how cool and successful this will be to a dev that makes it become a "we" thing.
This allows the dev to make small decisions several times a day that align with your vision. Meet and work together and iterate in real life as much as possible to keep bringing positive energy of how this thing is breaking new ground in this problem space.
I would personally stay away from production houses because I don't think I would be able to share my vision as direct and with the same weight, which would at least to some extent limit their motivation to make my project really stand out.
This allows the dev to make small decisions several times a day that align with your vision. Meet and work together and iterate in real life as much as possible to keep bringing positive energy of how this thing is breaking new ground in this problem space.
I would personally stay away from production houses because I don't think I would be able to share my vision as direct and with the same weight, which would at least to some extent limit their motivation to make my project really stand out.