If it is about securing the future, then without doubt it is the safest way to enjoy the future. What we save today will surely help us in the future.
I can agree that investing in crypto is the way to help our financial strength in the future. But I don't think it is the safest way, investing in crypto has a high risk, no one knows what to happen to crypto investment in the future. That's why we don't invest all our money in crypto, just use the money that we can afford to lose. Put all money in crypto investment isn't the right way to secure our future.
Crypto are a new market compared to stocks or gold, and investing in cryptocurrencies is not protected by law, so the risk is very high. Crypto is currently considered a high-risk, high-reward form of investment with of the scams surrounding it, so invest with knowledge and don't put all your money into it with the desire to change life quickly. It can help you but it can also destroy you, so invest wisely.