3K for Graphic Designer with 3 years experience in total.
Thats the best you can get by now and prepare to stay there for the next 3 years because you almost  reach its limit unless you sacrafire work life balance working in some 4a agencies.

You will be dead fish after 3 years with almost zero exposure. Printing production is your final form, try pickup from there see any  supplier you able to get close to.

What sport goods? Not adidas, not Nike. Takashima? : Hehe:

Why would a company pay you 6K to do design while a fresh grads or senior can get at 3K? Because you have grown old?

Production are final form of design industry.
I am interior  designer so now may know what I'm doing now.

I love to meet any designer exchange our opinion towards the industry. After all design is not a business, it's a community where great people love beautiful things. Make love not War among our industry.