Congrats on publishing your first original song! It takes a ton of courage to actually release something you've produced, and by virtue of having done so, you have already gotten further than most people ever will.
I think the two main areas that you could focus on for the time being are sound design and arrangement.
As far as sound design is concerned:
You're using FL Studio, which comes with some super powerful synthesizers such as Sytrus and Harmor, but it doesn't have any good realistic sounding virtual instruments. You can get good realistic sounding virtual instruments as 3rd party plugins (some even for free), you can learn how to record musicians, or you can embrace what you already have and make electronic music with some really neat synth sounds in it. If you choose to do the latter, I recommend checking out
SeamlessR's channel on YouTube since he uses mostly the stock FL stuff and he explains things in a lot of detail so there's a lot that you can learn from his videos.
Either way, I recommend using as few presets and samples as you can, because when people listen to your music and recognize a preset or a sample that they've already heard many times before, it makes the experience of listening to your music a lot less magical. It is especially a bad idea to use the drum samples that are already loaded in the basic project template in FL Studio, because anyone who ever used FL is extremely familiar with how those sound. You might have to use drum samples to an extent because of how much easier it is to get a good sound using samples rather than synthesizing your own drum sounds, but in that case, it's a good idea to combine a bunch of different samples to design your own sound out of those samples and/or search for more samples online.
As far as arrangement is concerned, I think it would greatly benefit the song if you created more contrast between the different parts of the song. I can't explain what I mean super well, so I'll just demonstrate what I would do:
https://dl.dropbox.com/s/lh9femlehzlupez/asdfasdf.wav?dl=0
Not saying you have to do it exactly like that, and obviously since I made it super quickly, it's not a great production overall; it's just to demonstrate how you can create a bit more drama in the song by introducing more contrast between the different parts of the song, which I did by making the main hook bigger by putting a lot more stuff in there.
Songwriting-wise, there's absolutely nothing wrong with the song, it sounds great. It doesn't sound super unique, but I think you'll naturally learn to discover your own style a lot more as you write more music.
Good luck on your journey to become a music producer!