Downgrading speed & reducing cost, or swapping to competitor

Hi,

I'm currently trying out T-Mobile's 5G home internet; it's working reasonably well. A week ago I placed a cancellation on my Xfinity account, which hasn't been enacted yet -- I need to "confirm?" However, I would consider staying with Xfinity if you could make an offer somewhat comparable to T-Mobile.

The reason for this cancellation is simply that the billing rate is too high at this point -- I'm now paying an extra $30/mo to avoid the data cap -- and it's pretty much impossible to reduce rates as an existing customer. (I'm sure I could get a decent rate as a new customer.)

However, I don't need as much throughput as I currently have (800Mbps) -- I'm willing to downgrade speed.

- At Xfinity, I'm currently paying $113/mo for 800Mbps, unlimited data cap add-on, no term limit.

- With T-Mobile 5G, I'm now paying $50 for ~200Mbps, unlimited data cap, no term limit. (They're also giving me an initial $150 credit).

So, in short:

If you downgraded my Xfinity service to 200Mbps but kept the unlimited data cap add-on + no term limit, how close could you get to that $50/mo overall cost?