What makes any game stand out? Game Design is only part science, the other part is art. There is no checklist on how to make an RTS exceptional, or any game for that matter. Games tend to stand out, that either have exceptional good storytelling or a novel idea. That is the most general statement I could come up with.
You aren't a senior game developer I presume, if you are planning to produce a sellable game, I'd suggest to rethink your position. You would either have to compete with multi million dollar projects or search for your own niche. Both choices aren't easy.
I d suggest you think about your game, what is special and why people would like to play it and discuss it in the forums.