I have all of these whats app conversations (more than 4k) that I need to save all of these contacts numbers. for an easy access later on

I have all of there whats app conversations (more than 4k) that I need to save all of these contacts numbers, where I can easily send them all the messages I wants. I know that i can save them directly one by one, but it will takes me forever to save them.
So I need you to find me a way that I can easily save all of them in my contacts numbers for an easy access later on !

OR you can find me a way to send whats app messages without saving all of these numbers.


please if you dn't know how to work with this, save your time and mine. dn't reach me with " yes maybe I can help"