Build Muscle while still getting Cardio in

Hey Marc - GREAT YouTube channel....thanks!     I'm a 54 year old man, and I lift 5 days a week, sometimes 6 or 7 - depending on schedule, mood, etc.   I've been active like this most of my life, but  have always carried excess fat around my waist.    I took your body type quiz, and am a Somatype 4:4:1, but I think I trend more toward endomorph.   I want to continue to build muscle and lose fat as I get older, but I also have been advised by docs to bump up cardio, due to family history of cardiac issues (none with me, but I want to be mindful of history).    For cardio, I do 40-45 min in the gym (after weights), or swim a couple miles a day, several days per week.    I had feared some over-training, but after watching one of your recent videos, I get it that it's highly unlikely.    Recent adjustments I've made are moving to a Keto diet (seems to be helping) and doing your squat every day recommendation (I like this a lot, but I have a spine fusion, so often do a variety of squats versus traditional heavy barbell squats).       There's my story - if you've got some recommendations on how to maintain / add muscle and drop fat while keeping the docs happy on the cardio front, I'm all ears!   Thanks, Bill