You don't need to wait for the price to get down if you believe in XRP. You have any good times to buy with any price you want.
But if you are still waiting for the lower price than now, then you need to be patient and don't buy XRP at any price.
But if I were you, I will buy for some amount, wait for a while, if the price is down for the next days, I will try to analyze the chart, and if I see the chance for the price to getting down, then I will place my order buy.
I agree, if you think and believe that XRP is a best coin, then you dont need to wait for sometime to buy, have a portions on it and just leave it for awhile, but if you are trading XRP daily, its your choice, but for me, i am a strong believer of XRP since the beginning of time.