It is very saturated market. Seriously underpaid and the salary progress is the slowest among other profession. I know so many graphic designers that still earn below 3k in their late 20's and still below 4k in their late 30's or even in 40's. There are so many graphic designers available that employer don't have any trouble to find new fresh & young designers with below 2.5k salary to replace you, unless your skill are very2 exceptional.

Don't get too carried away with your passion and interest in art/design. It only fun in first few years of working thinking how lucky you are able to work in your area of interest/passion until after few years you realized your salary still stuck below 3k-4k while all your friends on different fields already earn double and perhaps more.