1. Lifespan of crypto related projects. If we do manage to sign some sort of contract with a business in the crypto sphere, how can we, from the outside, judge the health and longevity of the project?
Since you are providing support, you have people with a technical background, no matter how sustainable the project is as much as they can make payments.
If you want to predict this, ask the technicians at the technical side of such projects.
2. I have absolutely no idea how to contact companies that we could work for.
Perhaps this is the task of the marketing team, but this forum is one of the free places that enable you to promote your project.
Try to communicate with startups(check new ICOs and others) with cheap offers.