Greetings friend @emmy01, When the fourth bitcoin halvin takes place, the rewards will be reduced by half each time a block of this ecosystem is mined. When bitcoin started the rewards were 50 BTC. Soon there will be 3,125 BTC and there will be less left.

Everyone wants Bitcoin, but it is not enough for everyone, they are limited, this is where the law of supply and demand comes in, there is less supply with each passing day and demand increases, so bitcoin will still continue to increase. We know about the manipulation that exists in the market but this is another topic.

Success in the challenge.