Price diffrence and jupiter dex ?

Can you explain to me why it’s like that ?
By the Marketprice i should get fair value of 1800$ If i sell my meme coin but then it show’s i get only 1$ ? So why i can’t sell with the price it show’s ? I managed to entry early with Marketcap 1$ so i should get fair Market price ?
Even If market price slippage or price gap i should get atleast 300-500$ ? Or it’s the waiting game when more buyers coming in then i can get to sell and get 1800$ for my tokens or i should make my sell order smaller ?
Or it’s about liquity ? If liquity is low i have to wait when token is more known and more liquity?

Thanks