There isn't much you can do. That is an extremely low end CPU and integrated graphics. Even in the realm of integrated graphics. An A8 is a mid range selection in relation to other integrated graphics.
That laptop has a single channel ram controller. Sorry bro that laptop isn't meant for gaming. My laptop has an i7 6700k, 16gb ddr4, gtx 6gb 970m. I get 60+ god at ultra settings at 1080p. A buddy has similar settings but with a gtx 960m 4 go and also runs dota at max 60+
About all you can do is add more RAM and make sure that RAM is a matched pair for dual channel memory. The integrated graphics will get a small speed boost from dual channel memory. Also you will have more memory available for the GPU and OS. As 4GB is already low let alone being spread between system and graphics memory.