Great from a compositional standpoint, really enjoyed it. I think it's good that you want to familiarize yourself with mixing and mastering, both really important skills in media composition. I would advise to start using a "real" DAW like Reaper (or whichever you like) for this and search for resources on how to make your voices and tracks feel louder without clipping, like compression, limiters and clippers. There is a lot to learn there, but it's absolutely worth it, and a lot of information readily available.
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Don't worry about it, it's a normal step of the journey and I really enjoyed your song regardless. There are some easy steps like using a clipper on all of your loud tracks and groups/folders and experimenting with mastering presets that can be implemented without putting in a lot of hours, to give you a better idea on how to do it.