After researching the news sources, I decided to pledge my land and houses worth $ 40000. I use it to buy 4 Bitcoin
I will rent a small apartment with my family
I'm happy now
I believe that the BTC will increase to $ 20k next year.
This is as stupid as it can be. Never ever invest something which you cannot afford to lose, only then you will be able to make cold, informed decisions.
The price of bitcoin might increase to 20k next year, or it could be in 5 years. Can you afford the wait? if you don't, you lose.
What if it reaches 12k~15k instead? Are you going to cash out?
If you have a different source of income, and can literally forget about these 4
BTC and look at them in 10 years or so, then you are good. Else, you are in trouble.
Never invest what you cannot afford to lose...
Never get in debt for these things either, its not worth it.