Business and residential service at same address

I work with people who are in Europe and 7-8 times zones earlier than me. I had Comcast residential TV, internet and phone in my home for 20+ years. Never had an issue doing video conferences. 

post COVID, the bandwidth in our neighborhood seems to be maxed out. While I get 500+ Mps download speeds, I was struggling to get even 10 MBs upload. When video conferencing, my computer would constantly freeze up. I was no longer able to even screen share, yet alone host. 

I was talked in to upgrading to business internet. Quite honestly, the download remains about the same though the upload has improved to 30 Mps making it usable. (I’m supposed to get 200 upload on the business plan - fat chance). But none of the residential apps, WiFi boxes, etc work if you are on a business WiFi network. Comcast has software/hardware that looks for a specific business WiFi connection and if it finds it, disables the residential apps, boxes, etc. 

I had to pay for residential internet to get Stream to work for my wife who travels. So I now pay for both residential and business internet- at a cost of over $350/mo - but still can’t connect the WiFi Xfinity tv boxes. 

The only solution seems to be to set up a 2nd WiFi network in my home using a residential an Xfi modem/router. But I only have 1 coax line into my house. I’m reluctant to split it to run to 2 separate modems considering my internet upload speeds are so slow. 

Does ANYONE have any advice?