As you can notice, it is only the number of Bitcoins mined per day that decreased per halving and not the total supply. That trend will continue until the last one is mined.
This is the main point. Scarcity occurs not in the total supply of bitcoin, but in prizes that are mined. Herein lies the beginners mistake so far in understanding halving, maybe. Reducing the amount of bitcoin that miners get for each block is also a scarcity for the miners themselves and will also increase the difficulty.
2. The price will increase
This may appear true if you look at what happened in the past halving but this is not something the halving can dictate. The truth is halving will continue to happen every after 210,000 blocks regardless of its monetary value. This "price will increase" is usually the hype created by many speculators aimed at attracting new investors. It is the market that determines the value of Bitcoin. When a buyer and a seller agrees on a price, then that's the price.
Hype will affect the market, but there are many other things that can affect the market and that is like the development, adoption and regulation of a country. An increase in market demand shows that an increase in the adoption of bitcoin and the entry of new investors. The price of Bitcoin is of course an agreement between buyers and sellers, the more demand the higher the price and vice versa the price will go down when many people agree to sell at a lower price.
Fluctuations occur because bitcoin has become an asset that can be traded at high prices, people can still make fluctuations only if they have large amounts of bitcoin and of course its like a whale game.