Why am I Unable to Limit the Number of Connections

If you want to limit the number of users on your TP Link router then, you have 4 options :

1. First Limit the DHCP lease start and end address, which starts from 192.168.1.5 and set an end address at 192.168.1.9.
2. Setup up parental control if your router supports. Divide time slots between users and allow or deny as the case may be.
3. Upgrade your Internet Slab both FUP and Speed.
4. Use the MAC address filter on your TP-Link router. Use a password bank and a very long random password for your Wi-Fi. Make sure you are using WPA2 for your Wi-Fi.