If you noticed, I mentioned the "uneven parts," this is because what you are investing the money into will always have its encouraging and discouraging parts, so we should learn the level of risk and the plausibility of dealing with them and earning from them. This is what will help you to know the worth of the portion you are coming into each of them. Even as lousy as people are about crypto, wise investors recently warned that you should not invest more than 10% of your worth (affordability). That is the worst case because it is still a new project that people are hyping. You can invest more in the more feasible ones like stocks, indices and properties that will hardly fail you.
When people made mention of percentage to allocate in anything that has to do with luck or probability it seems so crazy and sound so weird because of allocating a little fraction to what you seems can't be reliable. There is always a reason why most people keeps saying that people should used not above 10 percent of their income because if that is Lost it could be very to forget about it than using a life savings or their whole salary to invest or trading volatile currencies.