FTP and Fitness going down, but why?

My first remark would be to read this post, and scan through the entire topic, to understand a bit better why your numbers do not reflect what you’re experiencing:

Check other topics in the Guide categorie to get more insight on how the numbres all come together.

A second remark would be to not do that commute aggressively every day, that will just induce too much fatigue. Do it twice a week at an intensity that feels challenging, but not exhaustive, and the rest of the week at an more easy intensity.
Third, make sure that all your other activities are logged with both fitness and fatigue. I don’t think that any of those you mentioned are by default set to only contribute to fatigue, but Weight training for example, will only contribute to fatigue and not to fitness. The reasoning for this is explained on the settings page:

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