I prefer to buy the RLB directly on the Rollbit site, after all there I can also trade it right away so it's easier to act if I want to sell or add more.
There are alot more advantage that you can get if you purchase it on site compared to cex / dex. Obviously there are some absurd fees on dex and if you are only going to buy or sell RLB then using cex isnt a bad idea but if you buy it on site, you can use it for RLB lottery instantly. Apart from that you can put it on liquidity pool with zero fees
Now it's just a matter of waiting for the price to decrease to be able to buy again because in my opinion the current price is still not worthy of being an RLB buying point.
Its currently $0.138 so yeah its dumped quite abit after the btc dump from its ATH at over $0.2