Yellow leaves on my boxwood.

Pictures of leaves only go so far. What's the soil Iike (pic would help). What are you watering practices?
 
Thank you for your reply, I water only when the top of the soil is dry, this month I do it every two days.
30% akadama, 30% kiryu zuna, 20% kanuma, 20% sphagnum moss.
 
Thank you for your reply, I water only when the top of the soil is dry, this month I do it every two days.
30% akadama, 30% kiryu zuna, 20% kanuma, 20% sphagnum moss.
Post a pic of the soil
 
This is a photo of the soil after watering ( Today ). I fertilize with Tamahi in the spring and BioGold in the fall. I haven't pruned branches since 2020; it's still weak.
I transplanted them just to check the roots, they are healthy, three times ( 2020 Akadama, pumice; 2022 pumice and 2025 akadama, kiryuzuna, kanuma and spagnum moss) I haven't pruned roots.
 

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It's been weak for five years now. I've tried everything: foliar fertilizer, solid organic fertilizer, Epson Salt, systemic fungicides, etc. I'm worried because four days ago I submerged the boxwood in water for 10 minutes, and the soil is still moist. It might not survive another year.
I just read online that boxwoods live 60 or 70 years in optimal conditions. Maybe mine is too old?
 
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