How to cut internet from other devices ?

[aboybaseball]

My ping level is over 9000 , there's any way to cut the internet from the other devices which use the same wifi as me ?

I have Technicolor TG799 v2
P.S : Mac filter doesn't exist in this shitty router

I tried Selfishnet it seems like it doesn't work and tried NetCut but the PC version affect only windows and the android version in beta , it works but sometimes bug and ruin my game