Rate Expiring yet AGAIN :( - How can we keep a rate for longer than 1 year??

Long time customer of 20+ years.  Every year our "promotion" ends and our bill jumps up.  This year, our bill will increase by an unknown amount as I'm writing this before my "promotion" period is up.   Two years ago I was told I was no longer in a contract, so I was a bit surprised that my bill jumped and I had to reach out to renegotiate.  I had understood then that my rate was being fixed then, but it appears it was not.   

Does Comcast still work with long-time customers and guarantee rates for loyalty?   This used to be possible, but it seems harder and harder to keep these bills manageable.  We have the most basic services we can have and will need to cancel if we can't keep our rate at a reasonable cost.   We need to have reliable internet since under covid our kids are still in online school and adults are working remotely.  

I would like to see my current rate retained, without restrictions and with some guarantee that it will extend past a year.  Is this too much to ask after all these years as a loyal customer?  Can you help?