This seems like an obvious one, but a lot of people don't really understand it. Including me. When I say dynamics I don't mean compression, I mean timing within your arrangement to bring an instrument in at just the right moment in order to create lift or drop. It serves the song, and it was something that I learnt, then firmly face palmed myself with a quick ahah!. I noticed as I would bring a flute into the mix at a certain point it would give the entire arrangement a different feel if it were placed somewhere else. I found this particularly effective with smaller sections that could almost be used as an intro to a new dynamic. In terms of creating a lift I find that adding an instrument with a melody then accompanying it with a similar toned partner would be very effective in creating a form of textural dynamics.