Are you running a exhaust fan?
I turn off the exhuast fan, put towel in tray of water with fan behind it. use a pump to keep the water recirculating on the towel.
Works for me in small area. But this area is using t5 and not getting very hot (70-74f) so that may be why I am having success.
I cycle the exhaust fan to keep some air flow and prevent mold. A small humidifier can also raise humidity in that same area but only if I turn off the exhaust.
If I run the fan 24/7 RH goes down to 30-40% or lower if it gets warmer.
I was looking into a commercial humidifier ($250-300)
Thanks for the tip on thew whole house humidifier, looks like a more cost effective solution.