MAC Address QoS Alternatives

My landlord’s setup is a pretty standard ISP-issued router with 2 repeaters connected to it (one for each floor). I talked with my housemates and they’re ok with me getting priority for internet speeds since I work from home, but our router doesn’t have QoS capabilities and ethernet is unfortunately not an option because of where my room is.

What are my options for better internet speeds? I don’t mind getting additional hardware, but i’m not allowed to change the current stuff (the hardware, but I can modify the router’s setup). I was thinking maybe a powerline adapter but ive heard they’re pretty hit or miss