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I always recommend this one. It holds 4L so I don't have to refill it everyday. It has an auto function that turns on and off to keep it at 65% humidity AND its super easy to clean because it a top fill.
I got my humidifier on Amazon, it's a 4 L and has an automatic setting where it'll keep the humidity at 65%. The only thing I don't like is that you can't adjust the automatic humidity but it wasn't too expensive. It's also top fill and easy to clean. I've only ly had it 2 weeks but I like it alot. You will need to mist the kokedama tho. I do mine once in the morning and once at night.
4L Top Fill Humidifiers for bedroom, 25dB Quiet Ultrasonic Cool Mist Humidifiers with Auto Mode Mist Level, Adjustable 12H Timer for large Living Room Office Desk (White) https://www.amazon.com/dp/B09J7ZQJMW/ref=cm_sw_r_apan_i_6C6638D5ZP1TF0S52S2H?_encoding=UTF8&psc=1
This Homech one has been pretty reliable
4L Top Fill Humidifiers for... https://www.amazon.com/dp/B09J7ZQJMW?ref=ppx_pop_mob_ap_share
I've had this one for a while and it works great! It automatically keeps the humidity at 65%