You'll just stay on the 75Mbps tier unless you make a change. It's about that time of year when Comcast increases speeds, so you may even see a free speed increase.
Thanks for providing that valuable insight nerdburg.
Hello Danold. If you'd like to review changing your service or if you have any account specific questions, I can help further. If so, please send me a private message and include your full name, service address, and account number so I can assist you.