Bitcoin price is not fixed. The price of bitcoin has a high fluctuating structure.
Can you predict the increase or decrease in bitcoin price?
Of course, we can predict the price of bitcoin but not the exact price. That is the job of the traders to predict the price as every right prediction will result to income on their part, there is no specific information that we could use as a basis to see the right price movement but what I am basing is solely on the news that will come up, if it's good news then it will help the price increase while if it's bad the opposite will happen.
Is it only right to estimate price by following bitcoin news? So if there's good news about bitcoin, everyone thinks that the price of bitcoin will increase.
Are technical analyzes like Forex markets valid in the bitcoin market? Are there parameters that affect the price of bitcoin?
i am by no means an expert in technical analysis but i can assure you that it is the same reliable as it is in any other market. and it is never 100% reliable anywhere.
based on what i have seen, technical analysis is best used as a suggestion. you make the analysis and see this and that are the possible outcomes that your analysis suggests.
and yes, news is very effective, although it is a combination of news plus time not just news alone and how widespread that news is.