A A10-6800K will help, how much depends on the type of work you do.
The passmark rating of a A4-6300 is 2217 with a single thread rating of 1384.
The A10-6800K rating is 4908, primarily because of the added two threads.
But the single thread rating is 1545, not a big boost.
Most games use only 2-3 threads and depend on the performance of a fast master thread.
If you will be satisfied with that, and if you are using integrated graphics, it is probably a good upgrade.
But, if you are thinking that a upgrade down the line is likely for a dedicated graphics card or a faster cpu for gaming, you are stuck with no more reasonable upgrades for your motherboard.