As a landlord I need advice for what to do for a tenant who is always late on rent without committing to eviction?

I assume you are charging late charges. Short of evicitng I don't see what else you can do.

Yes, you make sure there are late charges, often so much if late and then so many dollars a day it is late.

But to be honest if you are a landlord with a problem tenant you will have to evict at time