All the narrative of the op is directly pointing at a Bitcoin traders and not those who are investing, investors hardly loose their Bitcoin over market performance when they are in for holding their Bitcoin for a long time,  but as trader the vulnerability of lossing their Bitcoin is very high over market performance as in most cases the market moves against them while being hopeful for a short term profit maximization. In other words investors can still loose their Bitcoin when they are vulnerable to being scam of their Bitcoin and which is a different thing from lossing your Bitcoin over market performance just as that of a trader, an investor can only be emotionally affected when they make use of money not meant for investment to invest.

Emotions can be managed when there is understanding and not having too much expectation. For instance, an investor who doesn't understand Bitcoin but expects so much from a Bitcoin investment and invests an amount that can't be afforded to lose, and if there is no profit in the investment due to lack of understanding and wrong decisions, there will be emotion at the end and there is no way one would be able to manage it.

The only way people can control emotions in Bitcoin is to have understanding and to have that awareness of Bitcoin being volatile and an asset that can't be predicted.

Can't agree more. A lot of people don't understand the importance of the mistakes that we make, because a mistake you make teaches you something about what you are doing or trying to do, and multiple mistakes mean multiple lessons, and the more lessons you learn, the better you are going to become in that craft. As a trader, if you lose money even after learning everything and putting in enough efforts, then you shouldn't take that to heart and get sad, but you should immediately start evaluating all the process to find out the mistake that you've made, and once found, you should make sure you don't make the same mistake again.

Those who don't learn from their mistakes will stay behind, and those who do will keep moving forward. Remember, those who are labelled as the experts of this market are the ones who learnt from their mistakes and kept progressing instead of getting sad and saying that trading is not for them and they are not going to do it anymore. That's not the right attitude to have, if you have that attitude, then your journey will probably be filled with disappointments, and it will also be pretty short.

Loss occurs everyday is you are into Bitcoin trading, you will need to take it upon yourself to learn to prevent the losses because it is not possible to stop completely; because the Bitcoin market is volatile, but if you learn, you can learn some preventive measures that will help you to control your losses.
You need to avoid using emotions in your trades, it will trigger some decisions that will not favor you, so always have self control.

To avoid all these drama, buy Bitcoin, store the Bitcoin in your non-custodial wallet, keep your seed phrase safe and forget about it for some years, you will not complain about emotions again.

One thing I’ve learnt in life is that, should you decide to stay down and not rise again after you fall, you would be doing yourself.

What you’ve lost is gone, it’s either you put in efforts to build right back else you would find yourself at the bottom of your own emotions, being depressed over what you can’t make any permanent change towards.

It’s practically okay to invest in Bitcoin but, if an individual isn’t convinced or comfortable about it, diversifying into other aspects is just as good.

We are human beings, and nobody is above mistakes. When mistakes happen, we should learn from them. So, losing money in Bitcoin should never be a reason why we just give up easily and decide not to try investing in it again. What is really necessary is that we should learn from our mistakes so that we can avoid further damage in the future.But what really makes some people lose money in Bitcoin is the steps they take toward Bitcoin. For example, investors hardly lose their Bitcoin compared to traders it follows the right steps. Another reason people lose their Bitcoin is because they do not provide proper security for their Bitcoin. Just like when you ask some people, How  they ended up losing their Bitcoin they may tell you that their wallet was hacked or that they lost it through some other means careless shows that they did not provide their Bitcoin with proper security.

When you talk about selling their coins at the wrong time, are you referencing on value below what they bought them, or you are referring to when an investor has already seen their portfolio rise to a certain level and did not sell then only to later sell off their holding when the value has dropped below its previous high. I'm asking because both situation described means different thing.

Just as repeatedly said, and warned about, you are expected not to put the amount you can not afford to lose into bitcoin investment, this doesn't means that you should lose the money, but the point here is that, you should always do alot of due diligence risk management and not to be under any form of pressure when there is market uncertainty with your investment, being able to hold for a long period of time is key to avoid temporary losses in bitcoin.

There won't be success and possible profits if after losses, traders and investors allow their emotions to rule over their minds. Instead, they should learn to overcome those emotions because this is the only way to start again and this time, they will be more less emotional but more focused and driven to their end goals and future profits.

But honestly, it's hard to combat with your emotions. A lot won't succeed on this battle. But if you are really steadfast and loyal to your goal, you will do everything even if it means setting aside your emotions in order to succeed and taste your final profits.

In the OP it is briefed of not letting you down on losses out of bitcoin and anything else. In recent days there happened the coldcard hack. By the time came through a person's reddit post mentioned by our forum member stating his long term saving of around 2 bitcoin being lost. Those were his entire savings in terms of investment. He lost everything and he lost hope on bitcoin, here there is no mistake on him. Once again to start from the scratch is very tough as it has taken him around 8 years for this. In such situation anyone will go low,  for god's sake he has emergency fund and with that he was able to sustain. So, at times when we hadn't made mistake and we were to take the outcome it'll surely make the person emotionally down.