Has Alimony/Maintenance amount to be increased every year?

I and my ex-wife had filed divorce in March 2016 with mutual consent. I agreed to give her half of my plot, which is 100 sq yard or half value of the plot, and also 5000 per month as maintenance or alimony whatever it is called. I had to start 5000 from May 2016 only. We got our final divorce in November 2016. One of the decrees in the order is, to pay her 2.5 lakh (Her advocate valued the plot of 5 lakh) in 6 months time (which will end in May 2017), otherwise Court will force me to get the half of the plot registered in her name. I have been paying her 5000 per month regularly since May 2016, but I could not give her 2.5 lakh of the plot or value till now as I don't have this much money and due to demonetization I am not getting good value (max 4 lakh) for the plot. Sir, I with my retired 68 yrs old papa and 62 yrs old mother, live in a rented house. I don't have my own house yet. I have 4 sisters, all married now. We don't have bank balance at all. I work in a private school and earning around 30,000 per month. This plot is only asset for me which I purchased 3 years back only by lending money from my family and friends. I have still not paid the whole money back to them. Now she is asking me to pay 6000 per month from June onward. Sir, she is a physiotherapist. She runs her own clinic. She works contractually for hospitals. And She goes for home visits as well. She is well capable of earning. Sirs, I have to remarry again and also have to built a home for my family. I am in miseries. Sir plz guide me for this scenario.