Trying to figure out the cheapest way to keep the new phone without having to pay for two lines?

I currently have 1 line on the Essential plan, and my phone on that line is already paid off. I also have home Wi-Fi. With autopay, my total monthly bill is about $92. Recently, I added a 2nd line with a $900 promo on a Pixel 11 Pro XL, and there’s about $300 remaining on the EIP. The problem is that I don’t actually need two lines. I only need 1 line and 2 phones: my current phone for everyday use, and the new Pixel mainly for gaming at home over Wi-Fi. My questions: Is it possible to cancel the new line and transfer the remaining $300 EIP balance to my existing old line? Alternatively, can I keep the new line, cancel or suspend my old line, and transfer my existing phone number to the new line? I want to keep my current phone number. I’m mainly trying to find out if there’s a way to keep the new Pixel while only paying for 1 line. Ideally, I’d like to keep my total monthly bill under or around $100.