Michael, based on everything you describe, you really should be hiring more than one freelancer.
It does not make sound financial sense to hire a single freelancer for work like this.
How do you know that the freelancer you hired provides with the best possible value?
Hire 6 freelancers. Give them identical assignments. Or assign them to do different things that you need done.
Only continue working with the freelancer or freelancers who provide you with the best value.