This is like splitting one investment asset into two or more assets. This method may be interesting and successful for those who do have understanding and experience in investing. and for beginners, you might be interested but it's better not to. As you mentioned, there are many risks.
The choice of selling land or property assets to invest in Bitcoin may require the right market momentum. like a market crash that caused the price of Bitcoin to experience a very deep decline. and it makes it possible to buy large amounts of Bitcoin for long-term investment.
Buying one coin is only risk for example if a person who have more invest like I can say he has invested all his money in a single coin then it would definitely be too risk for that person who only have funds in one coins right now. If that coin falls then he will be in huge loss, but if that coin go up then he can get a good profit. So, there will be a 50% chance in each case. And when he splits the investment in more coins then there will be less risks and may be he got some good profit from 3-4 different coins.
And also, in the crypto and for the crypto taking loan from other and selling own house I don't think it make a sense, because it would be too risky and that no one like to sell his house for more risky tasks.