you may be failing because you are being to timid in trying to save it as a whole ...

you might want to go much further up the stem ... with a sterilized of fresh razor and make ...

you may be failing because you are being to timid in trying to save it ...

actually i cant tell if there are two stems or not ... but you might remove those two lower leaves.. and work up quite a few inches... right now.. they are droopy and might be sucking the life out of the stem trying to save them.. but you have others above ...

watch a few of the vids at the link below for guidance and wisdom ... i would favor wetted media rather than water ... and i would look to see if they recommend letting the callous dry before planting ...

ken

https://duckduckgo.com/?q=Monstera+propagation&t=ffcm&iax=videos&ia=videos

Yup agree I would be more aggressive with cutting damaged area off. Looks like there is a node above it. Better to save some than lose all would be my thinking... just my 2 cents. Good luck... it’s beautiful

yup, you need to ensure all of the rot is removed. you could slice off the rotten part lengthwise if you are unwilling to cut off all the way up to remove partial rot further up on that stem. no yellowing browning or translucent parts should remain once you are done. As Ken said, you should take off two of the bigger leaves and display them separately if you want. Those leaves can live by themselves for a long while.