Bitcoin users are still buying and selling this time you can't blame them if they are selling because its their strategy specially to make some big profits
That's a correct assumption. I personally don't even understand why some (I'm not talking about OP) people are against selling. It's what traders do. If people find it hard to understand, then they either don't know how to trade, or don't like seeing others making profits while they are not going forward with their "investment".
and bitcoin price will never reach $10,000 if people still selling their coins.
Whether or not the price will reach the $10,000 level at some point, that remains to be seen. But in order to get the price to go up to a certain level, you need sellers that allow their coins to change from owner very regularly. Example; You buy at $500 where after that you put up your coins for sale at $600. Another person will grab your coins at that level, and put them up for sale on another (higher) level. And that's how it goes. If there is enough demand, good sentiment, hype causing a massive bull run, then every sell order will get absorbed till a level where people will prefer to hold their coins instead of selling them. Long story short, coins have to change from owner which is done by selling. It's a crucial aspect of trading.