Are you sure you have done this calculation well? Because I don't think it was calculated the way it was meant because there isn't how 0.5 and 1 Bitcoin will have an equal outcome of an investment because with Bitcoin moves and the one of 0.5 doubled to 1 Bitcoin the second amount of 1 Bitcoin will also double in price given 2 Bitcoin instead of the actual number it was meant to be so actually you can say that 0.5 of Bitcoin can be highly profitable in the future but doesn't mean it can be the same with the amount that's higher than that, actually a person shouldn't invest based on equality of profit with others but instead they should think on how they can grow there investment.

The current time is a period to buy more bitcoin, the greed index is still prevalent and everyone believes that the price of bitcoin will continue to rise, even those who sell now the intention that the price of bitcoin will decrease in the short term and is an opportunity to buy more bitcoin for the long term.
If you are an investor, it is an ideal opportunity to buy, and if you are in circulation, it is a good opportunity for sale and purchase at a cheaper price in the coming weeks.

What you did is not a bad thing honestly, you are trying to save a life, but you did the right thing the wrong way, selling off your Bitcoin to pay for medical bills of your friend should have been totally avoided if you had  an emergency funds in place that stands as the last layer of protection to your Bitcoin investment, but because their was no measures in place like emergency and reserve funds, you were forced to sell off your Bitcoin holdings even though you never wish to, so in this your situation, it is lack of proper planning on days like that, days of emergencies that cost you your Bitcoin investment, I just hope that you learn from it and for it not to repeat itself again.
I have seen stories like this countless times repeating itself over and over again because most folks fail to learn, but in all we do, for the sake of our Bitcoin holdings, we shouldn't joke with emergency and reserve funds.

You can’t wait for a specific price before you invest in Bitcoin, Bitcoin can not be predicted and with the way Bitcoin is going you can’t wait for a perfect time to invest because it may lead to regret at the end, you can invest in Bitcoin in different ways and you can meet up with your demand or the amount of Bitcoins you want to buy, using a DCA method is the best way to buy when you want to meet up with the quantity of Bitcoin you want to buy, one thing i observe with some newbies when they heard invest as much as you can lose is that some think they can buy Bitcoin with any amount and be expecting big profits, the more you invest the more you earn profits that’s how Bitcoin works.

Honestly speaking am not a big fan of paying attention to what others think or say about me because I believe that life will not get easier, you as a person just get stronger, wiser, more skillful etc.

Why am saying this is that being a Nigerian is a pride to me, so if most remote jobs are close to us, to me it's their loss because we have more to offer than most of those set of people they open it for, that's why I will always recommend learning a digital skill like trading coding, web designing etc, these are skills that will pay you good money any day any time, and one thing you need to know about most of this skills is that you will not have to be at the mercy of anyone, if you are truly good, you will always be needed.

I am a crypto trader, I don't have to rely on anyone to earn a living in the market, I get rewarded by my performance, so why am saying all this is that shit or terrible things will always happen, you just be strong enough mentally, intellectually, digitally or any form to create a way to navigate your way around it, or as our leaders are not doing well should we continue feel pity for ourselves? No,  just cry if you must but giving up is never an option because a true Nigerian never surrenders.

Bitcoin or crypto-backed loans are nothing new. They're offered by both crypto and traditional financial companies. Even in this forum, it's available. A crypto-backed mortgage is just another kind of crypto-backed loan.

But why do you think it's a smart move to use your Bitcoin or crypto as a collateral when the market is down? Although, yeah, it helps you avoid getting liquidated, it also means you're getting a much lower value of what you have. You're risking your Bitcoin to a third-party in exchange for, say, 40% or 50% or 60% of its value. Personally, I don't think it's worth it.