Freaking out because my 1 year old was diagnosed with Hip Dysplasia

Our sweet golden boy turned 1 year just a month ago and we scheduled his Xrays knowing how predisposed golden retrievers are to HD. I received the report today that he has Grade D (moderate )Hip Dysplasia. I am feeling shattered and worried. I know this is genetic. His parents were both cleared from hip dysplasia. What do I do now? I am just worried because he is so young. I can’t stop thinking if we caused it to worsen. We did over exercise him when he was younger but we didn’t know that. We corrected ourselves when we realized what we were doing. We just bought a new house and it has stairs. It is not possible to not use stairs a couple of times a day atleast as all bedrooms are upstairs. How do I manage this?? He is not showing visible signs of pain right now.

Honestly just looking for some advice on what to do now and how I can manage and keep this from getting worse. Please tell me this is not the worst news ever and things would be the same😢😢