Hi MMKA,
As to the sound, a little improvement but ,not too much (to my taste, which is not necessarily your taste of course). You can go on experimenting forever and that could be a good experience, but before you start creating an ambience, think first about what you want to achieve. For that purpose, you can find thousands of good recordings on YT, and for sure in the classical style such as your composition. When you found a type of hall sound that you really like (for such an ensemble), you can try to imitate it (MIR, Vienna Suite, Virtual Sound Stage, Synchron settings...). Try this with both legato and staccato passages, because the difference can be huge. In your piece here, that is quite obvious.
Another issue to work on could be the natural bowing dynamics. If you work with CC1 or CC7 (volume), it can sound quite exaggerated. I always create the bowing with CC11 (expression), if not detailed enough with CC28 (Vel.FX), through automation. I never touch CC7 in my mix, except to set the basic volumes per group or instrument (overall balance).
You can enter the Vel.XF sensitivity or range with the dynamic range scaler (CC30). For higher strings usually between 92 and 0. For winds, that would be far too much and impossible to play.
These are just a few pieces of advice, not things to absolutely imply. Your own experience is the best school!
A good composition always deserves a good performance and that's definitely the case here.
Have a nice weekend!
Jos