Is it normal for a dog to be lazy most of the day? He doesn’t play unless he’s in snow or I’m playing with him. Rottweiler st Bernard great Pyrenees mix 3 years old

My dog had a bad 1st year alive as a puppy. He had abuse for at least 3 months, then I had to get evidence of the abuse the took a couple more months to get. He has had a hard time playing after that time. After bathroom breaks he gets zoomies, has daily 45 min walks and play time for an hour a day(30mins at a time) with me, then he just lays down and/or follows me around the house. Is he just low energy or high energy with trauma? How do I get him to play by himself? Am I giving him enough to do or is this boredom? I hope I'm reading into it too much but I feel he should play more.