Like @krzyimprt said, it all depends on what your motherboard can handle, not just in the socket type (i.e. FM2 vs. FM2+), but in terms of what CPUs are officially supported (i.e. some motherboards might only accept the 65W chips, while some can go all the way to 100W).
That being said, an A4-7300 is kind of weak, being a dual-core chip (or, more technically, a 1C/2T CPU). So there are plenty of 2C/4T options you might have:
-- If your motherboard will only accept Socket FM2 chips, then at the least you should be able to go up to an A8-6500 or A10-6700. Although slightly slower (3.5GHz base for the A8 & 3.7GHz for the A10), their boost clocks are right on target with your current chip, & you'll gain the extra core/threads. If you...