90% if my calls are for kids at 12-15 months old after mom is done maternity leave. After that, they’ve typically settled into some kind of care setting, and only leave if unhappy or moving or changing jobs.
If you want just the older ones, have you considered doing before/after school or running a preschool program in the morning? I considered doing this to give myself a few hours off a day and to focus on the older ones.
Toddlers are a very busy group, and will require more supervision, more equipment etc..
Maybe try to make yourself a “niche” market so that you stand out from the rest.