@Jannier-
You have far better qualifications than most works in child care centers in the States.
Grandparents can provide a highly enriched environment. My grandmother let me play in sand, mud, snow, and water. Her button box, picking up sticks, finding acorns, picking vegetables, and playing in the cow pasture gave me all sorts of sensory experiences. We went shopping and visiting, played with our dogs and cats, and other things now thought harmful. She read to me, and encouraged me to play with open ended toys, as well as found items.
There were no toddler groups fifty years ago. Children played with neighbors, relatives' children, or those of family friends.
My grandmother and mother had me pottytrained before I was two, dressing myself, and drinking from proper cups.
Diagnosing special needs in very young children is risky; why pathologize children who may just need more time. Allowing for individual needs is something not so easy in a communal setting.
Good enough care from parents or other family members is generally better than the disinterested care available in most American day care.
Family members can impose stricter discipline than timeouts and gentle warnings. It's better children cry now than you cry over them when they are grown. Before children learn from others, they need rules and values at home.
On Mumsnet, grandparents are usually dismissed as not understanding what today's children need. Love and the sense of connection and commitment from grandparent or other family care is invaluable.
When my grandmother developed dementia, I cared for her until she could not stay at home. My mother or I, often both of us, visited every day when she was at the nursing home.
Three is very young to attend even nursery school. Here, sending to part time nursery school at four and full day kindergarten at five is more usual. My sibling and I could not have managed all day school without naps or rest at four.