Hey TP-LINK !!

I'm using Deco M4 since 2023 and i never get 50 Mbps speed on 2.4 GHz on both 20 MHz and 40 MHz idk why? My connection speed is 100 Mbps download and upload and i never faced any issue on 5 GHz so is there any fix for 2.4 GHz ?? My linkspeed on 20 MHz is 72 Mbps and 150 Mbps on 40 MHz.