why is this token price so declining this month? What caused it?
In general, I'd say it's because more people are selling than buying.
There can be several reasons behind this, including, but not limited too:
People losing trust because of things like the bounty payments
Everyhing going down due to tax and other regulations in several important crypto countries in the world.
people panick selling in general because the market has been crashing for over a month
etc.