Apart from not being able to stay as a part-time tutor for college students, the biggest problem is that they don't live by this degree themselves. It is more casual to teach according to your own ideas. Teach if you want, teach if you want.
If he is a part-time college student who comes for salary, he can't help you implement the education content in a down-to-earth way. The ultimate harm is the child and your organization.
Therefore, you should not change the essence of counseling. Just retaining college students is also a temporary solution.
Besides, they come for the salary, and you still want to keep them when the salary is low. This is a contradiction in itself! This contradiction cannot be solved. There are only two ways out, one is that the boss raises his salary, and the other is that college students don't want their salary. These two points are impossible in themselves! The contradiction of your problem itself is money, and there is no other way to solve it.
Or it can provide him with added value, such as how long he can get promotion space by working in this institution.
Finally, I suggest you communicate with your boss. Relying on part-time college students to do education is not to help children, but also to ruin their future! Harm set, harm get.