Okay, I'm going to be "that guy" here. Three of those aren't "hacks," they're just bad advice.
Don't use a capo on mandolin, unless you're working with a singer in odd keys and haven't got the full fretboard down yet. If you look at mandolin like a fretted fiddle instead of a guitar, then the clouds will break through with a shaft of light and a chorus of angels, and you'll realize it isn't a baby guitar.
If you think a credit card is a good pick, you haven't tried the good ones.
Okay, make your own strap, fine.
Orange peel in a zipper bag... seriously?
Humidity control is important for acoustic instruments. Don't rely on a case humidifier, especially something ad-hoc like this. Get a decent meter so you know what your situation is, then humidify your house, or at least your music room.
My "hack" for mandolin is just to find the genre of music you like, or several, and play the snot out of your instrument until you sound good in that genre. There are no shortcuts or hacks.
Sorry if that sounded a bit grumpy. I'm turning into a curmudgeon in my old age. Use whatever you find useful, and play on!
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