The halving was a major event that attracted many new investors to bitcoins, some started investing seriously some months to the halving just so to make some profit from it.The halving was what attracted them, but now that the halving has come and gone, do you think that the number of new investors will reduce for the now until the next halving is close again?
If they just entered to make the one-time reap then the numbers will go down but I don't think once they tasted the profits it will be too difficult to give away that and wait too long, the urge to buy before the next halving will make them to stay. And it also won't affect the long term users either, cause they know bitcoin is going to rise no matter what, only people who entered at $70K might be thinking about cashing out and never come back.
I think you are referring to traders. In the market there is a mix of two types of investors, short term and long term. In BTC market analysis, you will notice that as its price tends to rise, investors become more motivated and aggressive to buy. In this situation some traders enter and exit in short intervals and they keep coming back every season. And those who are long-term investors buy at the dips price as per their opportunity and continue to exist in the bitcoin market uninterruptedly and they are the ones who end up being the big holders.
Investors who are holding Bitcoin at the top price ($70K) I think most of them have their investment plans aimed at the $100k price and for the long term. I am only talking about real BTC holders here.
Investors who hold Bitcoin for the long term know what it means to make real profits. When you make such an investment, daily, weekly and monthly movements of the market will no longer affect you negatively. This situation also includes an important detail in terms of human psychology. People who cannot wait after investing also experience psychological difficulties.
The two types of investors you mentioned are very different from each other. Those who aim for short-term profit and trading are very different from those who invest in the long term.
In response to the question asked in the topic title; I do not have a prediction about whether the number of new investors will decrease or not because the factors that determine this situation can change very quickly.