ESP32 WIFI LoRa 32(V2) - How to enhance the WiFi range?

Hello, guys!
Looking for one way to improve the wifi range, I found some like adding an alternative(DIY) antenna by a stick of wire attached to the PCB “antenna”.
But, another problem is born, in this hardware version the antenna is hidden (like an internal layer).
Does anyone know how to increase the range through this solution or another tip?
I’d appreciate some tips.