-click the chat icon at the bottom right of the page to open a chat session -the chat icon looks like '3 dots inside a circle' at the lower right -type AGENT into the chat window to connect directly to a person rather than the AI Do be aware that Adobe's staffing is impacted by the virus, so wait times are long
If the bonus is in the form of a "redemption code" you can perhaps decide when to start it, to coincide with the end of your yearly commitment. You may need to change user, depends what you were given.
Be aware that canceling your paid plan will incur a cancellation fee of ½ your remaining subscription. That is to say, if you have 8 months left on the subscription, Adobe will charge you for 4 months. This is part of the subscription terms you agreed to when you purchased the subscription. As Test Screen Name suggests, it might be better to wait until the last month of subscription to redeem your code.