You're supposing that the salary cost is the only cost. That's not how it works.

Firstly, are you offering this assistant Paid Time Off? Paid Sick Time? Are you making social security contributions? Health care contributions? Or do they need to do that?

You're happy with 10 hours per week. So say 3 to 5 pm? Or would some of the tasks be time-of-day dependent? Would you be happy

By the time you're paying a living wage, and all the extras are added in, it's costing more like 25 to 30k a year. Maybe some folk can afford that, but I'm guessing most can't.

But what fo randos on the internet know? Find 3 mates. Pony up some cash. Hire a person. When it's working, find 4 more randos and hire another. This is how businesses start...