Do I upgrade my CPU or GPU for CS:GO

Mar 30, 2018
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I am thinking of doing something with my old shitty PC so that I can play CSGO with good FPS.

*My budget is around Rs.5000 (75$)* So my question is what should I add or replace?

Specs-
Processor: AMD A4-3300 @2.5GHz with integrated Radeon HD 6410D
Motherboard= Gigabyte - GA-A55M-DS2 Micro ATX FM1
RAM= 1xCorsair - Vengeance 4GB (1 x 4GB) DDR3 + 1x 4GB RAM DDR3
PSU= 450W
Storage= 500GB Hard disk

I have no idea whether I should buy a GPU or replace my APU, please help me out.
I have no intensions to upgrade it later as I would be buying a good gaming laptop after 1.5 years :)