I bought around 500~ XRB when it was worth 6.6k Satoshi and I really regret that I sold every single one when they were worth 14k Stasohi. I don't know if I should buy some more now or wait for a likely dump.
Sorry bro, but you are basically coming to the wrong conclusion. You did everything right with XRB except that you sold them. So what should we learn from this? Do your research like you did with XRB (or however you came to buy them), and buy again into coins that are still cheap now. Since you mention Raiblocks. Colx will have similiar features and is still very young, but do your own research. And then... This time... DONT SELL THEM for a quick buck
Good luck!