if we look at the previous data onto btc then we can know about their price but the recent conditions are different because most of the coins are infected but BTC have this capabilities to reach this place based on this don't believe on humorous news see data.

Since you are very new, I will suggest you to study Crypto-space for a long periods of time. You may study it from review sites, Bitcoin Forums, Sites that you like to read but I will suggest you to simply avoid youtube at first, as there are many unusual Vlogs that will make you confused. Rather you make researches from authentic sites that will make you someday an analyst.

It's important to draw a distinction between an "economic expert" and a "Bitcoin expert".  Your subject and the first line of your post appear to conflate the two.  The media will always portray them as one and the same, but the reality is completely different.  Any "expert" who is trying to analyse Bitcoin using fiat models probably isn't much of an expert.  Bitcoin was created because fiat has serious problems.  It's a whole different ballgame.  Most of their rules don't apply here because we tore up the rulebook and made a new one.  So everything the experts think they know is wrong.  

And even if they did manage to garner a vague understanding of how Bitcoin worked three or four years ago, that doesn't mean they understand it now.  The situation constantly evolves.  A growing userbase, new features, radical proposals, ideas and innovations in the pipeline - no one knows for sure what the outcome of all this will be.  That's what makes it so interesting.  So if those of us who live and breathe this stuff can't accurately predict the price, these random so-called experts being interviewed by the mainstream media have no hope.

If you see news articles with economists talking crap about Bitcoin, take it with a pinch of salt.  They're not as all-knowing as they like to think.

Plus, anyone who did somehow know what the price is going to be would naturally keep their mouths shut and quietly make a fortune.  They wouldn't blab to anyone who cares to listen.  So it probably is an attempt at manipulation, as you alluded to in the OP.

For me, long term price speculation (despite the fact it's all anyone seems to care about for the most part), is actually the least interesting aspect of all this.  It's just guesswork and opinion.  The technology and societal impacts are far more enthralling.  

I am a market analyst myself but though I am a newbie on this field and I do not have a very complicated understanding on the market but even by just using our common sense we can already tell that such value for bitcoin which is 2500$ is a joke. In this trading playground we have the so-called bearish limit, this limit is the end of drop for bitcoin and it bitcoin goes deeper than that then the whales themselves will go bankrupt and much worst bitcoin will really crash if we went down below the limit. Thus it is impossible for bitcoin to go back to 2500$ since the last bearish limit was at 5000 + $.

I think people are entitled to their own analysis and I believe that most of the people who are engaged in bitcoin should also do their own research and not just rely on what was being predicted by some people. For other people doing such assumption, these could be part of the agenda made by the whale manipulators to drag down the price of bitcoin in the market.

If you spend enough time in this market you will witness numerous price predictions become just another prediction rather than a reality.

People predict the market based on HOPE just for their publicity.

I mean look at John Mcafee, he was charging 100K $ for a single tweet. After predicting Bitcoin to 1 Mil $ by 2020, I really hope it will become a reality, but who knows the poor bastard might eat his junk on national tv.  

that is why you should not read any random person's prediction online no matter how much they are being advertised. they are newbies who pretend to be experts for example McAfee was just advertising himself by making an outrageous bitcoin prediction not because of the price but because of the short time he expected it to happen in. and he was doing it so that he could advertise ICOs and get paid $100k

If you want to make money investing in crypto, you must first remember that you should not rely on analysts' predictions or analyzes. Because there are hundreds of analyzes of daily price charts and this analysis is dissimilarity

when it comes to bitcoin you should only trust your own personal judgement and analysis of the market otherwise what you read online is most of the times pure nonsense written by those who want to spread FUD or have little understanding of the market.
it is not that hard to form a speculative opinion either. you just have to watch the market for some time and see what are the things that makes it move.