I really like the atmosphere of this since it gives off post apocalyptic vibes or to me, it kind of makes me think of the end of the world. It also makes me think of a character in a story who's either experienced a lot of suffering or has seen a lot of their friends die or disappear. It could also be for a character who's spent a long time pretending to be someone to the point they don't know who they are anymore and they could be trying to find or figure out who they are.
There is one thing I really like about this song and that is how the mood kind of shifts with the song or the drops are more heavier versions of the buildups. The beginning and first drop are an example but the part that starts at around 2:12 and the very final buildup before 4:19 or 4:18 are another example. All these parts have that melancholic yet happy feel to them but the drops then shift and it feels more heavier and less happy. I like the way it shifts since the buildups could be someone looking back on their memories and the things they've done or the people they were close with. On the other hand, the drops could be more to reflect how things are for that person at the moment and how things are no longer the same for them. They could've lost the people close to them or just maybe that person wishes they could go back to the life they used to live. That might just be how the song makes me feel though.
Anyway though, you've done a really good job on this and I'm definitely going to listen to this while working on something I'm making in Blender since this should help to give me some ideas for it! It says Main Menu theme but it makes me wonder what this game or whatever this song is for is going to be about. If this is the theme then I'm sure that the game is either going to be really sad or it's going to be some end of the world/ post apocalyptic game but I might be wrong though.