Agree with @HarlemHeat360 the legato, dynamics, and articulations are missing from this arrangement.
It could be your orchestral VST but the samples are also pretty dry. I don’t have much experience with orchestral production (mainly use strings and horns as pads in the background) but you need to be automating a lot when it comes to orchestral work, especially when it comes to the dynamics and legato to add realism. Christian Henson is a good resource for working with orchestra midi
It sucks a decent orchestral VST is like $500+ but I’d recommend getting a Spitfire Audio bundle at some point.
Keep at it!