One single person may not have any influence on the price by doing this, but together we do have some sort of impact.
yes I agree with you that the more buy and hold the coin in a certain period of time will make the price movement is increasing, in addition there is a limitation of bitcoin suply that I know only 21 million, as well as the market economy if the supply of coins is getting limited while the coin enthusiasts the more you want to have of course the price will increase.