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.