I’m 53 and was in a similar position last year. Too much intensity or too big of a week would leave me exhausted and tired.
What I found helped enormously was more long, slow distance base miles. Last spring I did 12 weeks of old school base miles and by the 8th week I was flying and faster than ever (breaking all my PRs). Now, big weeks don’t leave me buried and needing a recovery week.
Other things that seem to help with recovery is getting enough protein. I’m trying to get as a minimum 20grams x 4 or 5 times per day. 20 grams is the magic number that kicks off protein synthesis so it’s better to get a smaller dose several times per day rather than a larger does 2 or 3X per day.
Not underfueling on rides also helps. If I do a 60 mile, 3+ hour ride that burns 1800 calories, I need to eat a giant breakfast and bring along substantial food and then eat a good recovery meal afterwards. If I don’t I’m more likely to have sore legs and feel exhausted.