It could be big losses on the stock exchange,fatigue from trading itself or money that allows you to invest in cryptocurrencies and not to trade every day
Maybe you followed the advice of your friends and quit trading
Any stories are interesting

For someone that have made up their mind to quit trading because of an advise from a friend, that means they can never be a profitable trader. A trader that have made up his or her mind to learn trading should be aware enough that with every hardship comes ease. They just have to face the reality of trading which losses is part of it. If they don’t give up, with time they’ll be able to benefit from it. If you’ve made up your mind in the first place, quitting shouldn’t be an option when a friend advises you to.
Another long term losses someone can quit trading is if he continues to lose in trading but later got married and having children. He will know he has to quit to be a reliable and a responsible father. To quite trading would be a wise choice for this kind of person. This is in accordance to some researches.
The reasons most people quit trading are losses, long term losses and having more responsibility in the family like becoming a husband and a father.
This is the best answer to the question the OP asked. Trading when instilled in someone takes time before one can leave it. A lot of reasons might be there to convince you to leave trading and if that reason isn’t convincing enough, you’ll still want to keep trying and hope that maybe your lucky day will still arrive. There are some responsibilities that when arrived in your life and you want to be seen as a responsible person, you’ll quickly leave trading and focus more on something that will make you profitable after the so much loss you must have incurred from trading.