I saw some real estate project using the blockchain technology like the REX, REAL, and some others but I didn't see a successful and stable real-estate token up until now, they just launched and stay for sometimes then they are almost gone, so what would be the guarantee that this one will be a prolific investment and become stable as a currency?
No such guarantee is possible. CProp is merely an idea, no monetized product exists. Putting money in at this stage is pure speculation, so you will either lose everything or make a lot.