no, it will not help, you need to replace the wifi/bluetooth antenna, the board has nothing to do with it
https://www.mobiledefenders.com/wifi-and-bluetooth-antenna-for-iphone-13-mini.html
note that you need soldering skills to replace the antenna that is connected to the board, but you can try to replace the antenna that is held to the board by a flex cord to see if that will fix it. if you don't have any soldering skills, and if that doesn't work you may need to take it to a shop.
https://www.youtube.com/watch?v=P-vTM-QQy00