They sell moss stakes that are golden for monsteras. Not only does it start them out with a stronger vertical base with which to stay upright, but they are natural climbers so their aerial roots will eventually grab hold of the stakes and aid in their strength and growth.
Like this: Y&M 2 PCS 16 Inches Coir Totem Pole Plant,Coir Moss Totem Pole Coir Moss Stick for Climbing Plants Support Stake Pole, Climbing Indoor Plants, Creepers https://www.amazon.com/dp/B085HTQ2CH/ref=cm_sw_r_cp_api_glc_fabc_qqEaGb9C6MKF7
I’ve been using this MOTIV - Small Cool Mist Humidifier for a couple months now. It needs to be plugged in and works well with my small plants. Sometimes I just bring my plants into the shower and let them get a good steam while I shower.