Thank you for inviting me here.
Nice composition. Good choice of instruments. Some areas in between like legato strings are very well executed. I like when piano part and the rest till the end.
Now what I noticed that as soon as the song starts there is a heavy compression going on giving 'pumping' effect. To avoid this first of all do not use any compressor at all. Find a frequency chart of each instrument and put an Eq on every instrument and remove any unwanted frequencies that are not the part of that instrument. Find an orchestral panning chart and put the instrument on it's place. Now lower down the volume knobs and slowly move them up until everything sounds clear. Leave headroom of -3 to -6db to let every instrument breath easily. Put a gain staging plugin on master channel and slowly increase the volume. You will ultimately find a pleasant surprise that how good everything sound now without compression or effect. You can also put a limiter with it's default settings. Don not use any reverb as yet until you are satisfied. Before composing, go to youtube and listen any song which attracts you and gives you inspiration and try matching the overall impression of your song to that one. This was mixing part.
Compositionally, I didn't get any idea where it is coming from and going towards. Lots of ideas sometimes clutter the composition. It's not bad if executed rightfully. But it is easy to take a simple idea and develop a full blown song on it. And this is what everybody wants to hear because it retains in our memory and we follow the rest easily. Too long piece also loosens the interest of audience. Keep it between 3 to 3 and half minutes initially. Have a look at this to get an idea https://www.youtube.com/watch?v=GgT2oKurtk4
I like this piece very much but it needs some work. I hope what I said is not displeasing you but as I also started at some point, I needed some advice which I am handing over to you. Hope to hear quality pieces from you.
Best!
Emid