My 7+ years of startup journey have taught me a few things. Hiring is the core. Finding people to assemble an Avengers team is what will keep things moving. With limited resources and things falling apart, having responsible team members makes things easier.
A well-defined process will be on my list after. But unless we have a team of responsible people with a well-defined process, there is no way of succeeding.
It is not age or number of years of work experience for owning responsibility but a collective vision. For a collective vision, everyone has to believe in the cause.
What has worked for me is aligning incentives for all in the team and pushing everyone to act like a leader, not just a resource.