wait from start to buy at a low price after the price rises then we sell it at multiple prices and the result we earn several times the profit if it can be called by gambling?
You can call it whatever you want. Basically its a type of trading. Now some people think trading and gambling to be synonymous but I can tell you that they are not ever remotely similar. Only the fact is both are associated with risk and high returns if you are lucky.
In gambling you can never win in the long run because the house edge is always going to make you bust. While in trading if you are watching the market you can make predictions based on the market FUD and news. But then there wont be any single shot wipeout of your money unless you end up buying some tonnes of shitcoin.