As for the members of the forum, there are not too many who have been active for more than 5 years, but as can be seen from some answers, some have kept part of their coins for more than 5 years. Yet here we are talking about a period when Bitcoin was still quite cheap compared to today (the price was measured in a few hundred $), and few believed that a value like today is possible.

I personally have some coins that I earned as a beginner through faucets or through signature campaigns, but unfortunately I did not keep everything I bought during 2014 and 2015 - I consider it a good lesson for the future. I also hope that the time will come when it will not be necessary to convert BTC into fiat in order to spend it in the usual places such as shopping malls, cafes, restaurants.

Misconceptions I think many people are having is that holding is the only thing to do once you've invested into something. But that's absolutely wrong. The market price is not continuously and consistently increasing over time. Market analysis is needed in order for an investor or user to make decisions whether to invest or sell at a certain point because that would generate income not holding alone. Profit from holding for years won't be as big as profit from selling at certain price points, "bullish market" times to be specific. The will be losses to some cryptos because not all cryptos are having price increase especially the small ones in this industry.

Five years ago bitcoin was only 500$ and those who held bitcoin that time until now probably had big profits if they want or try to sell their holdings. Anyway, for the newcomers still holding bitcoin is  possible to get big profits in the next 5 years. For we know that bitcoin has slowly been adapted by the community believing its worth and even trusted that bitcoin independency cannot be ruled by any third party services except in the use of centralized exchange. Well, we will be hoping for those DEX  to also get a good chance in balancing the centralized exchanges.

I still have a full coin from 2015 (that makes it five years!) I remember betting with a friend about that! I should have bought and held 10 full coins not only one from 2015! I was already very skilled in terms of how to use btc but I didn't go the extra mile. Still, I feel good today knowing I was able to extend and preserve my wealth and hopefully that of my kids.

But there's no assurance that the market price will continue increasing in the future, so doing so won't benefit you, just my two cents.
But that depends on your goal as an investor. If you are just aiming to experience having an amount of it, then holding for a longer period of time would be fine. But if you are into profit, I won't suggest holding for that long, because there's still a possibility for its market value to depreciate. Thus, it would be better to analyze the market, perhaps in this case.

You wont really be getting solid feedbacks or information on what you do seek for because you do talk about those people who had been holding since 2015.

We cant be sure if the people who had responded into this thread are valid or solid holders or just trying to pretend that they had held but actually they had already sell off.

Why it is important for you to know? When it comes to holding then this do involved lots of patience basing of on all the volatility that we have seen
into this market then fighting that kind of emotion wont really be that simple.

firmly believe that no one has held bitcoin for that long even though we know that bitcoin is a long-term investment. because bitcoin changes occur every 4 years and at that time everyone is competing to sell because the price is usually high.
it is clear from the many that there are still saving but not because they want to invest but because of negligence so that they miss high prices.

May be that is true. But I am someone who regret the fact that I sold most of my coins when the prices were low. In theory, it is always profitable to sell at spikes and buy at dips. But in reality this is never practical, as we never know what will be the peak price and when the coin will bottom out. Anyway, I have learnt my lesson and I am keeping most of my remaining coins for the long term.

My first engagement with Bitcoin is way back in 2016 where the price is only about $600-$700 and unfortunately, I wasn't able to hold for a long time due to the reason of no one exactly knows that Bitcoin will grow this much and also because I have financial crisis back then so I had no choice. Only if I have known that Bitcoin will be this much, perhaps I just hold it in my wallet and I am pretty sure that most of us are thinking the same way. However, it's never been too late you and I can now accumulate Bitcoin and Hold as much as you can, at least we are now certain that Bitcoin has the potential to grow even more as mass adoption occur.

Well, you are right. Maybe from the 100% people who have bought 5 years ago. Around 95% has sold maybe 50%-90% of their holdings. Except the Winklevoss twins and other known strategies and bitcoin investors, they've held a lot and also took some solid profits during the heights.
I've sold some just a few months ago and would continually do it but wouldn't put on my sale more than 10% of my asset.