I posted earlier this week about possible rot of my indoor blue chalk sticks. I noticed some of the stems were turning brown/black and mushy. Please see the attached picture. I removed the rotted stems and cut them off and then reinserted the remaining bit into the soil.

I think the problem is I repotted the plant in a much too large pot which didn't have good drainage which caused the rot. I also noticed a good number of what I think are fungus gnats flying around.

What's the best way for me to save this plant? Thanks

I would remove & propagate the tops, use an unglazed clay pot in the future, and a different kind of soil without any peat in it. If roots are rotting, gnats would be attracted to that source of food, and they just naturally thrive in peat anyway.