Select YouTube TV Existing Customers: 4-Months $20 Off Each Month

There is a $20 off for 4 months promo under manage plan for YouTube TV. No need to go through any cancel steps. Go to your settings page in a desktop browser. Under membership -> base plan to the right of $82.99 click manage. If you are fortunate (ymmv) you should see an offer to save $20 a month for another four months. If you have the offer accept it.