Internet perf suffers with too many devices

So with all the college kids home at this crazy time, I am hearing complaints about internet dropping occasionally.  I have a 4 bedroom, 2 story home and have not observed any complete dead zones- it is just the occasional complaint about perf.  I have 6 people in the house, at any one time there could be 5-6 devices streaming a class or enertainment, and variety of other dormant, but connected, devices.  My router is in my office downstairs, and I cannot move it centrally as my desktop PC is connected to it via ethernet cable. So I am looking for advice on the best solution. I am considering:

1) Upgrading my Xfinity internet - I am currently on "X1PreferredPro" with "Extreme Pro Internet" which "promises" a max download spead of, I believe, 600Mbps.  Comcast offers a service with 1Gig internet speeds

2) Buying the xpods to place in the various rooms throughout the house

3) Buying 3rd partty "wired" extender which, I as I understand, I could plug into a coax cable connection point upstairs which would increase capacity to wireless devices connecting though that device versus the full wireless extenders.

Would appreciate advice.  Thanks