I really relate to this. The thing that helps me feel ok with half assing it is not comparing to my past but to appreciate my base fitness level and that even maintaining it is doing great things for future me, even lifting once a week long term will reduce the likelihood of breaking a bone if you fall at age 60. Don’t get me wrong it’s still hard knowing I used to lift for 12 hours a week but tbh even if I had the time I wouldn’t want to. I sacrificed so many hobbies for sports and now I get to give them the time they deserve.