You don't have to use all your money to invest, even if you are not married yet or have other responsibilities, the best approach when planning to invest in Bitcoin is to buy with some percentage of the money you earning, maybe through business or a job.
Planning and financial education are vital things when investing. We can't just put everything on investment as it was not a smart decision but only form some percentage like allocating 40%. As we are in the crypto world, the more we should be more careful in investing because the ROI is not fast and sometimes it takes years. That is why it is advisable to spread our funds to different investments so that whatever happens to other investments there is another to back it up.
If you do this weekly or monthly you won't feel any pressure, always remember that health is wealth.
We can apply the DCAing strategy if we can. We always have to remember this - invest only the amount that we can afford, we don't need to exceed our limitations.