If you could help that'd be awesome. Here's the link to the song:
https://soundcloud.com/andycii/test/s-FOe5y
It's an instrumental for a pop song
Hmm. It kind of is what it is, so in that way it is already beautiful and the answer is dependent on what you mean by professional. If by professional you mean "more alive", then it means you need less quantization, less samples, greater sounding samples, less repitition, better tuning etc. If by professional you mean depth of sound etc. it basically means more efficient use of the frequency spectrum, for instance that you filter the sounds, control various frequency ranges of the sounds etc. and do so against a very efficient monitoring landscape which all in all allows for a very good gain structure.
There is tons of stuff you can do to make it professional sounding, an acoustic and an electric guitar added to the production would totally change your sound. So it's kind of about what you want to create.
But keep in mind one thing. When you simplify this down to the individual volume faders and nothing else, it is what you can do only with those that will roughly tell you what kind of performance you can get from your current setup and skill level. You should not underestimate how different a mix can sound just from how you volume balance it. This is what engineers should be focusing on when they talk about "professional sound" and this is why your monitoring is so rediculously important when you aim for a very pro sound. It is much easier to control the transients with the volume faders than it is to do so using compressors. Both are needed, but very pro sounding mixes are way better transient balanced due to the volume balance they get from their monitoring performance. This is why compressors have become so hot within the home recording circles and why great monitors have become so hot within the pro recording circles. It's a matter of knowing the difference between setting the transients with the volume faders mostly and doing so with compressors mostly. With volume faders you can maintain the frequency relationships more (resulting in a softer, more natural and bigger sound), with compressors you are forced towards compromises.
Early on when you start embarking on the journey of recording/mixing/mastering, you should be focusing on how to achieve a better sounding dry mix using recording, monitoring and volume balancing only. That will give you a good start.
I invite you to join the Indabamusic community and mix stuff out there. That will give you some added perspective on it... If you are inside of a "sample bubble at home", it can really help to narrow down your perspective on this in a negative way. Pro sound is a bit more complicated to achieve than many understand. It's not like you just get yourself a couple of sound sources, record some samples, quantize a little, copy some beats and consider it done. It is different. To give you an example. My pro setups are so advanced that I need the HD version of Pro Tools to carry out what I need to do, the non HD version is too limiting for me. And that's just the DAW software. Eventhough I have that much amount of power applied in the mixing and mastering stages, it is still the basics I'm mostly dependent on to produce a pro sound. To get pro results mostly out of only the basics, is quite advanced and quite expensive. It kind of requires a professional approach. And once you are in that land, you focus on the sound, not on money... The rest comes naturally...