My review, your song.

Needs mixing, IE put a limiter on each channel so things don't red line, incresae volume of quiet channels, and use the EQ tools to make instruments play in their respective tonal ranges; Bass is low, melody middle, etc etc.

Add subtle reverb, slight delay and chorus to your guitar sounds. The FL slayer isn't a good guitar instrument, but some effects can make it sound so much better. Perhaps not more real, but less bad.

Song is a simple bass track, beat melody going all over the place. Make the bass fit the melody more closely.

Pay attention to key signatures.

This song sounds like you just need a lot of practice and time writing music, as well as learning the software.

3/5 (generous) 5/10