I've been doing the same, dull rotation pretty much exclusively for about three years. I'll try other things and end up back with this.
It is nothing fancy or complicated. I have a theme for the day and plug in the workout that catches my eye. I like that it has plenty of wiggle room to include rest days and/or days to focus on balance, mobility and flexibility. These three aspects of fitness become more and more crucial as one ages.
I do have some injuries and limitations to work around. I'm also hypothyroid, which zaps my energy and motivation sometimes. (Which means that sometimes I skip the Intervals.)
Sunday: Stretch, Mobility and/or Balance
Monday: Steady State Cardio
Tuesday: Upper/Abs & Intervals
Wednesday: Steady State Cardio, Mobility or Balance
Thursday: Lower/Abs
Friday: Stretch, Mobility or Balance
Saturday: Total Body Strength
Sure, it looks boring. But, I have kept to it through the "world going to hell" year and didn't gain any weight.
Find something you enjoy. That is the miracle rotation!