Looking for some input

Mondays are my long training hike and the past 2 Mondays on hikes I do regularly I have felt like shit mentally and physically, and my legs have been heavy

I only do Z1/Z2 training and my pack is less than 10 lbs.

This is my schedule:

Long hike, usually 3 hours up AeT the entire climb, 2-3 hours down below recovery HR.
Our trails are all loose rocks so I don’t make up much time on the way down -3000-4200 AEG

2 1 hour strength trainings. These are not hyper intense as I only do non technical hiking.

2 base training days, 1 outside basically flat hike 90 minutes AeT, 1 treadmill 15% grade about 60 minutes for about 1500 ft gain

1 recovery day, I usually do a 75 min hot yoga session

1 rest day.

I tried to use the TrainingPeaks app, but I just figured out the TSS and I had garbage in for my thresholds etc. I have corrected that as of today.

Am I overdoing it and if so what adjustments?

Am I just too old for this type of training? I’ve been training for about 6 months and recreating for about 5 years but prior I was just a blob.

My nutrition is pretty solid so I don’t think that’s a factor

Is it possible that I am losing fitness?

Thanks!