What should i do

Hi Bro, I think is bud rot. Sorry.

Hey there, bro! 👋 The purple buds either happen due to the strain's tendency to change bud color to dark.....or it could be phosphorus deficiency caused by incorrect soil pH. I recommend keeping it in flowering for a couple more weeks, setting the soil pH to 6.3. If the plant continues to show deficiencies, then I suggest harvesting, after flushing the substrate! 👌😇👍 Good luck, my friend!