On top of miles, intervals and perseverance, I might suggest getting some lights and do early morning rides. With family and work evenings after work can mean cutting into family time. There is something to be said about the peace and solitude at 4:30 in the morning. That said, that has my running time since sometime in the 2000's. Nowadays I commute by bike when the weather is dry and then ride after work a couple of days per week. Needless to say, no kids at home nowadays!! I don't group ride, but pass up an occasional rider when I am out, so not doing too bad at 55.