Hi, ​@Arman Shayan!

Create and invite your contacts to subscribe to a Messenger List (1) in your automations, then you can subscribe them to a sequence or broadcast to those who subscribed:

Also… you still have to comply to Meta's policies regarding content you send to users AND/OR if your contacts report many of your messages as spam, you still can get you page blocked. 

​@Fabio Gaulke  I've never used Sequences before, can you tell me how to do all of this if, for example, I want to send 3 different notifications to users? 

i use broadcast outside 24h and not got blocked

how many message u send to get blocked ?

in my opinion if someone will complain or when Facebook checks 

I want to send “ Get Update”  block once. And then send them different notifications. Having appointed a specific day and hour.