When the price was crashing, I remember telling my friends to buy as much as they could(also told them the risks involved). No one listened to me. Back then, Ether was somewhere around $100. About 2 months ago, my sibling called and told me he just bought 1 ether(At about $500). Not too bad for him. BTW, as I usually say, bitcoin isn't about the price, it's about the currency.

It is happening, again and again and again.
At the beginning of the 2017 I told my colleagues buy at least 5BTC and at the end of this year you can buy a very good brand new car for that. No one listen. They are said it is a scam, bubble, MLM, it is a thin air and so on.
So I am told them ok, so you can invest in AMD and TESLA shares which are cheap and in few years will fly.  And gues what? No one listen to me...

As you said, the best strategy (if you are not a daytrader) is just buy and forgot about that 5-10years. I am always smiling on the guys which are told me that they are loosing money, that they bought for 10k and now it is 3k.
But they are not understand, that they are not loosing anything, they had the same 1BTC like before. They will only lose it when they are sell it for fiat lower then they bought it...

I went through that link you have here and it looked like some of the posters there did not understand well what bitcoin is. I read coments from legendary members and was disappointed they talked so much ill about bitcoin. I wish we can find out what they have to say now that bitcoin did not die according to their prophecy.

That's the best reply to a silly people who don't know about the actual position of bitcoin and gives trash statement like this. There is also few people who sell their coins while a correction happens to crypto market. They get panic and think that bitcoin going to die. Time always show them what bitcoin is and how far it can reach.

How about now? Its 17550 as of this writing on Preev.com. Asking out on what would be his feeling at the moment? and that would really be that regret on missing out that he hadnt accumulate
wayback when bitcoin was still on 3k value.Well people cant really avoid to give out those emotional kind of reaction when everything is on deep reds.Even myself can say in bitcoin that time
where i do even believe that it will go below down 1k which is understandable that fear will really be overcoming on us but for those who do take the risk then those people who would really be making
money at the moment.

I havent poked up someone but i have seen lots of them saying  that bitcoin is dead on that time and when bitcoin did hit 10k then they do changed up their minds
and how much more that we are almost hitting that 20k ATH?

We will always have those type of people around that dont have bitcoin but always looking for the down fall of it. The type of person I want to be wont care about whatever happens to the price and keep it as long as possible without any worry ; having enough money in the bank to buy bitcoin in the dip and extra fund large enough for retirement. These are times you dont check the chat daily and care about what anyone says

Anyone who denies Bitcoin can be called uneducated people. You can only feel sorry for them, but you should never argue with such idiots. Time will always put everything in its place. There is always a person who will say: "But I told you so."
A good proverb says: "The dog bark, but the caravan goes on."
Bitcoin doesn't need any criticism, it has lived and will live its own life. Yes, it is volatile, yes, its price is different, but otherwise, it would be a different coin.
Only those who believe in Bitcoin are worthy and own it. Well, those who splutter with hatred, let them continue to stand still, wasting time and not trying to become more literate and educated in the field of cryptocurrencies.

For every time we poked any Bitcoin dissident, we cause them great regret for missing out. And that is good. But for their ego, most of them won't admit their regret. You can imagine someone who had loose $10,000 in February-March this year and didn't buy Bitcoin which could've fetched them around 3BTC. Now 3btc is worth over $53,000 for one Bitcoin is now $17, 815 as I type this. What a life of regret for your friend. I hope you screenshot the current price to them.

Crypto is for folks who are in it for a long term and that is the reason why people are always encouraged to invest in top crypto. However, if you are part of the person that buy bitcoin around 20k that year and you saw your portfolio drop down to 3.2k per bitcoin, you will also feel devastated and you wanna quite. What do you think will be in mind of that guy to bought pizza with huge amount of bitcoin that year. I guess any day he sees bitcoin trending and check the price, I will always feel sad for the mistake he had done. That is irony about life.