When you use leverage, you are not buying the currency, nor is the platform buying it for you; it is merely a bet, and the majority are the losers betting on a currency. The question here is... how is manipulation done? The answer is that platforms provide future data to market makers, and market makers move the currency opposite to the future if it is worth manipulating. This process is done either by selling or buying on their part.

What if the currency has a quantity of one million coins and you bought with one million instantly? Its price will become more than 1 dollar.

However, if you enter contracts and leverage, you do not affect it, and even if you buy with a billion, they will manipulate you, my dear. If you want to have an impact, buy the currency and do not use leverage, and do not deprive your money; may God not bless you nor bless it.