This is the reason why a lot of people jump into bitcoin investment and think that it's a get rich quick scheme and run at loss because they fail to learn the basic knowledge of bitcoin and understand how they can plan on investing and hodli for a long-term.
Most people that don’t have proper knowledge about bitcoin do see bitcoin as a Ponzi scheme, and that’s why most people do end up jumping into it, they believe they can easily make quick money from bitcoin investment, but things doesn’t work like that, if you jump into bitcoin investment, then you going to end up regretting at the end because you definitely going to lose. People that claim they having signal groups are the set of people that makes bitcoin investment looks like a Ponzi scheme, they are ready to say anything just for people to join their group.
If you are investing in bitcoin, then you shouldn’t be having the mindset to make profit within a short period of time, your intention is to hold for long term, and if you are holding, then you should learn the appropriate way to hold your bitcoin so that you won’t end up losing your bitcoin after holding for years.
Sure, many people get it wrong these days because of the people they believe online, claiming to have signals for the right time to invest in Bitcoin. Those ones are purely traders chasing quick profits, and out of greed you can lose everything before you even know it. Most of them only do this to earn for themselves. They create groups that newbies can join and blindly believe everything they say, and at the end of the day, when those newbies lose money, they quickly conclude that Bitcoin is just like any other investment.
However, there is nothing like timing the market when it comes to Bitcoin investment. You cannot outsmart the market or predict if it will go down in the next hour or tomorrow. As you said, the only mindset to have when investing in Bitcoin is long term growth, not to be deceived by anybody who claims they can predict how the market will move anytime soon.