I also enjoy lifting weights and I recently started doing high-frequency, low/moderate intensity training throughout my workday. I'll just choose an exercise for that day and do it many times per day. It's always around 50-70% effort so pretty easy (eg. if I can do 10 pullups I'll only ever do a set of 5 max). That way I have perfect technique for each rep and set and I never get close to failure. I always feel refreshed and never beaten down and I don't have to set aside specific time to lift (I'm currently trying to just maintain while I do technique work). Yesterday I did it with front squats for 10x3 of very high quality reps. I plan to increase the reps/weight slightly once it gets super easy and repeat.