Century Link - 1.5-3mbps - Xbox wired connection vs Wi-fi users…

Okay so at my house it’s me and my parents. this has been a struggle playing video games online for so long. I’ll lag when another device is on the Wi-fi and it becomes unplayable.

My dad frequently is on the computer and my mom on an iPad or phone. And I’m trying to game on Xbox with a wired connection. Our internet fluctuates from 1.5mbps to 3 mbps…

I’ve done the obvious having them turn on their wifi and what not if they aren’t using it and all that but when they do use the internet it’s not even the same game I was playing 10 seconds before.

I’ve looked at port forwarding and all that but I must be doing something wrong or it’s not effective enough for me.

What can I do?