It feels a bit sharp or stabby at times. Perhaps some variation in velocity or some slight panning would help. I might suggest spreading out some of the octaves to fill out the frequencies and reduce instruments contesting for the same space
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Synthet on YT has been a great help to me for music in general. His videos are pretty fun too. He does the official tutorials for FL Studio on their channel as well. I can’t say I have any one go to besides him, but YT has been a pretty helpful resource. FL Studio also has a lot of demo projects built in that you can analyze and break down, which is another good place to study. I struggle with the producer side too.