actually everything in crypto is very risky and it is a natural thing to be careful about. but the risk just depends on the coin and the treatment we will do. if we invest bitcoin the long term, at least once every 4 years. it is certain that it will not experience any risk because it will definitely increase in price, but if it is another coin, of course there will be a risk.
Other coins also have a different level of risk, because I see other coins like Ethereum can also provide commensurate returns in the same time frame as you mentioned, so Ethereum is also worth considering in terms of long-term investment.