Prioritizing my router or machine internet traffic

[FieryColds]

I was wondering how to prioritize my router or my desktop traffic so my internet does not slow down when others are using it .

I have two routers one main router in living room and one down stairs connected to coax and both are functioning but the one downstairs is only Ethernet ,

so I was wondering how could I prioritize my router on the basement or my machine connected to this router by lan , make it a priority out of both routers . 
 Main router is a Fios g1100 and the other downstairs which is mine connected to coax its a actiontec MI424WR Rev.

[Cang_Household]

What you want requires a QoS feature on the router, which Verizon routers and many other consumer-grade routers don't have. What's your subscription speed? I would recommend you to increase the speed to accommodate higher usage.

[FieryColds]

I do have Qos in advance settings but I’m not sure how to select my router or my machine to prioritize it

[Cang_Household]

G1100 does not have QoS feature. Where are you seeing that?