Hello all,
need advise, if any exist

I am trading btc few years - but it seems I havent learnt anything. My plan was to use bitcoin volatility to earn some extra btc, but it seems I am not able to do this.
I am selling/buying always in wrong time. Using volume as only indicator, as others do not make sense for me.
For example I see a series of red candles with increased selling volume, price crossing support line (like today crossing 7040, 7000, 6900 USD) so I sold 0.8btc in expectation price fall to 6500 usd as few days ago.
But 1.5 hour later price changed and went up and my prediction was again wrong. And the same is during increase of price. If the price hits e.g. 10300 usd and starts falling I do not sell, because I am not sure when it will turn again. And then I usually miss fall in price from 10300 to 7300 which is finally 3000 usd, what you can earn on 1 sold btc at correct time.
Am I doing something completly wrong? Or it is not possible to predict the movement of btc?
thanks
P.
I think need a good timing for that one you need to buy bitcoin now and i know bitcoin goes up. Very hard to get a timing when buying bitcoin because we don't know when bitcoin goes down and up. The best thing you can do is follow your instinct or your feeling when you gonna do it. Because investing in bitcoin is most good decision that you make. Bitcoin can goes up the price anytime. So be smart and think positive always.