Yes, no doubt about it the fastest to multiply your bitcoin is through gambling or betting, Maybe in just seconds you can double your money or any sort of cryptocurrency, But the downside is you can also lose all of your bitcoin or money in seconds. It's very risky I don't recommend doing gambling. Unless you have extra funds and ready to lose.
From the same perspective, i don't recommend doing trading. Both are made for stupid people who didn't hear about "Probabilities" in mathematic. All gains you made, are a lost for someone else, there is no productivity.
Put your money in something productive and useful, then you will find the right way to keep dubling them for more than just a once.