I am very much not comfortable with the idea of selling your house, two of your houses in that matter to buy Bitcoin.
Where I come from people invest in Bitcoin sell it and use it to buy land and house. You have already gotten a land and house on it and you want to sell it to buy Bitcoin.
I do not think that it is a very wise move, assuming it is only the house it would have been somehow understandable but now you will sell both the house and the land it is on to buy Bitcoin. In as much as you said that the houses are abandoned which means no person leave in it and it is deteriorating every now and then , that means you can decide to sell it off now that the market is in bear. In the next 4 to 5 years you will get your return and be able to buy more than what you have now.
It is a risk, and everyone takes their own risk according to their dimensions
This is too.much a risk to take, how can a man sell his only shelter making himself and family becoming homeless just to buy Bitcoin, this world is a gamble yes and know one know what will turn our fortune around, but then risking a house to buy a highly volatile asset like Bitcoin which does not have a time frame to when and how the price will act in the future is not a risk to take as a man.
I advise you only buy Bitcoin with the funds you can afford to look away from for life without demand, that way you will have the motivation to hold for as long as possible.