Ahhh,the great adventure of HOW to get some ethernet cable where you want it. Up and through the Attic? Basement? Etc. Sometimes “where there is a will…” applies to this one.
Option 2: if you try wifi and it’s not quite delivering, there’s this other option called Powerline ethernet,which can sometimes get you an ethernet link through existing power lines in your home. The plug at modem and plug at AppleTV locations might be able to work with ethernet.
So try improved wifi first and if it is insufficient, maybe order 2 Powerline boxes and try that kind of Ethernet connection. That worked very well for some of my relatives with no good way to route an Ethernet cable between router and their AppleTV.
Option 3: I’m guessing you are buying a new router to try to get better wifi vs what you have now. There’s an option there called mesh wifi which basically gives you “nodes” to spread wifi around a home. Some of those come with a few ethernet ports on them. Router makes a wifi 6 or 6e link to a mesh node you put near your AppleTV. Use ethernet cable to connect node to AppleTV. This is like running a virtual ethernet cable from router to that node.
Not buying a new router - just gonna up the service to a higher, business plan, which should allow us to get faster upload speeds, and more data.