"to many" is a perfectly acceptable phrase in written English.
You can use it when you want to describe something that is excessive or in excess. For example, "He had too many responsibilities to handle on his own."
Dictionary
to many
determiner
An indefinite large number of.
synonyms
Exact(60)
Proud uncle to many.
Devoted friend to many.
Best friend to many.
Mentor to many.
Cherished friend to many.
Caring friend to many.
Talk to many students.
Loving aunt to many.
Great friend to many.
Loving friend to many.
Friend to many.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com