There is no obligation to buy bitcoins, you just have to think that every time you invest a little bit, you will find yourself at a very profitable level after a while.
Bitcoin investment plans are often long-winded. But the matter of investment is completely your personal matter. When you have enough money you will invest and when your income is less then you will reduce the amount of investment.
Even if someone started investing $100 per week into BTC near the top of the first 2021 peak and through the second 2021 peak, and he continued to invest consistently and persistently that $100 every week for the past 3 years, he would be profitable right now since he would have had invested right around $15,700 and he would have 0.558 BTC
** (which would be worth around $22,320), and personally, I think that would be a great place to be for a person with that level of a discretionary/disposable budget..
**[b]Edited:[/b] Here is the link for DCA of $100 per week for last 3 years
https://dcabtc.com?sd=2021-01-24&sda=custom&f=weekly&d=3_years&ac=10000&c=true
You can check out his advice it might be good for you.