Need som help with a wifi pager code - Heltec Wifi 8

Hello, I would like some help with a web-based pager i’m trying to build. My problem is that I want to get the maximum text size of “waiting” message and incoming message. As it is now, If i increase the font size of the incoming message, it looks very strange and bad. Wished I could handle more than 20 characters messages and that the text had been maximum. Anyone good at coding who can help me?
Board type is a Heltec Wifi 8.

Here is my code: