Great rain sample in the beginning and transition out of that.
Your composition is fantastic. I recommend doubletracking that guitar-like synth to the left and right; you may use two different instruments and slightly different amps to achieve a wider feel.
Your 808 is a bit loud in the sub range. Recommend turning down the sub so as not to drown out other elements of the track. In fact I might sub it out for a saturated saw instrument entirely. If you are partial to the sine, up the volume somewhat and turn down the very low frequencies manually with EQ. The rest of the track is simply not loud enough to support it.
The section at 2:20 is beautiful. Turn down rain very slightly. Possibly pan it around or add in other whooshy FX to taste. I trust your judgement.
We resume for a chorus at 3:12 with the same aforementioned issues, until 3:27 when we get into a nice synth line. UwU
I have a hard time picking out your kick drum. May process it with something like KSHMR Essentials Kick.
The next section through 4:20 blew my mind for a hit second, even with such minimal arrangement. I would not use the sub bass so high up and may switch to a more subtle instrument, or bring it down one octave.
The drum kit here is very slightly getting on my nerves, as it doesn't do your writing justice. For one, I would turn it up a notch. For two, the velocities on the hi-hats stand out as either not very sensitive or almost all the same. Shop for some free drum kits or samples and see what happens.
You may also benefit for writing each and every part of the drum kit to a different track and apply various FX and processing to them, again to your taste.
Solo at 5:30 is SLAPPING. Could use some delay, reverb, panning, chorus, etc to your tastes. It just sounds like it's laying on top of the track in the center. Particularly obvious when it's soloed. Beyond that though, it is so well played that I don't care too much. Just a little sensitive atmospheric touch would bring it from noice to epic.
The track itself is quiet and would benefit from a free internet master or your own hand at compression on the master channel -- OR just using the amplify effect in Audacity.
All in all, very nice cohesive piece, limited seemingly only what your software and mixing can at present do. Save this and other works of the same quality for a rainy day, when you can revisit them and bring your vision to life. It's fabulous.
Thanks for coming out to NGUAC!