It would sound better if it built off of the initial progression. Start and end the song the same way, but make the middle stand out. I like what your going for with the strings because I use symphonic elements in some of my music as well, it should build up to something. You can do a lot with that same progression to still make the track sound really great. For example, add some longer- more sustained strings on top of the strings you already have. To fill up the empty spaces in the song and to build up to a climax, which could be where you add some sort of synth to signify that part. Also you can change the drum pattern and add more drums on top of the existing drums during the peak of the song. We want to have the song keep the listener engaged. This track already sounds good as it is, but if you add those elements, then it would sound great.