To sell or not to sell when coins going down?!

I've got some people asked me whether should they sell some coins (even at loss) and why them coins going down instead of going up.
See, I am super surprised why people over here is so impatient. If coin doesn't go up immediately, they start to stress about it and anxiety kicks in. Don't you trade ever with that mentality. You will never succeed here. Real investors and traders know how to handle that stress and they don't stress over coin stuck in price for 1 week. They know how to wait and take advantage of that. They re-buy on dips and use ladder techniques to average that coin price. Real money comes to strong hands and patient mind.
We are not talking years. As if you were non-crypto investor who needs to wait years of bear market.
I can't stress this enough: don't you sell at loss and please have some patient.

S&P500 is having around 10% of gains this year. These traditional investors (who invested in stocks, bonds, metals) are happy with this 10%. Here, in crypto world we talking hundreds of %! Per month!

And hey, just hodl your coin and you will be able to sell your coins with profit later. That way we have 100% success rate.
Don't be weak hands and have some balls. Invest maximum 10% per call or even less. I got some folks jumping all-in when hear call. If you reading this, hey you crazy! That nuts! Do no that!

We doing hundreds % on cryprtotrading! Promise me to have some balls that can wait, strong hands that don't panic hit "sell" button and clear mind dedicated to success. Have all of this and u will be rich!