I suggest the following:

1)Chat is only available at a distance of 100 blocks between players.

2)For a larger radius, you will need carrier pigeons or crows. You should also add a new property to a sheet of paper (like a book, but with one traveler). It can be increased in size by creating a player from 4 sheets of paper in the player’s inventory

3)It is also worth adding the Certification Seal. They will increase the transmission speed of the letter (no seal = 5 minutes, regular seal = 3 minutes, lord seal = 1 minute). Each print will depend on reputation (no seal - from 0 to 100, regular seal - from 100 to 1000, lord seal - from 1000)

P.S. I apologize for my english