I've always been into this sort of style of ambient, it fits in with the chilly winter motif you have going on. I'll also add as someone who likes to dabble in similar styles, I think ambient/soundtrack-type stuff is always challenging to make since it sort of has its own set of rules and whatnot. I really like the evolving arp, adds a good amount of motion while staying on track with the main idea. I do think the percussion could've been a little snappier - maybe with some slight reverb on the snare and a sidechain on the kick drum.
In regards to arrangement - I think that's honestly the hardest part about music! However, I do think the ending for this track makes a lot of sense with the long reverb tail and the rhodes/synth gradually slowing down. What I would've personally done to end this trsck would probably involve experimenting with lots of reverb (something like a shimmer, maybe) or paulstretch in co-op with the bitcrush - but that's just me, I like goofing off with what I can get away with by just going nuts with the reverb when I want to make something atmospheric. It absolutely goes without saying, but I think a ton of tracks could end in a ton of different ways - try studying your favorite songs and how they end! I always find super-active listening to be helpful when coming up with ideas and techniques. Hope my super geeky ramble helps at all! :D