Reducing monthly alimony payments post ex-wife's remarriage

I paid my wife a discretionary lump sum & agreed to pay AED 6k monthly. She has now remarried & had another baby with her new husband.

I have my daughter three times per week to live with me & pay for overseas holidays...etc., that she has with me 2-3 times per year.

What are the prospects of having these monthly payments reduced (say to AED 3k or less) or even cancelled so we each pay for our own costs of jointly raising our daughter?