I'm just so content....
@rhess is correct. Grammatically, your example may be a short (and more common) way of saying, "I am so content when/while I am taking care of...".
Yes, that's proper. You could even use the infinitive, making it "I'm just so content to take care of..." and it would still make sense.
No. I don't know much about it. But I would like to know more. Thank you so much!
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