Do you have any hotel stays coming up.? There are quite a few hotels which give 500 miles per stay.Or you can apply for spg membership, get the star points and transfer them to skywards miles.

hotel stays are only viable if you were planning to stay there anyway.

however spg recently sent me an email giving me 4000 bonus star points per stay up to 12000 star points if i stay in their hotels irrespective of the hotel

there are several hotels in India which cost less than $50 and 4000 star points which are equal to around 5000 skywards miles is a bargain for less than $50.