Your monthly income depends on a specific period of time. Even if your monthly income is low, if you can create a budget from there, you can plan your investment. Even if your income is low, investing in stages will yield good results. Whether your income is low or high, you must have an interest in investing. You can invest if you understand your income and spend it wisely. The price of Bitcoin always fluctuates. People are hired with the hope of profit.
Every person invests for the future so that they can get a good result in the future or earn a good amount of money from it. As you said, investment is never done with the hope of profit. Investment is always done for profit but investment is long term so that we can get a very good result in the future.
Investing is not something that requires a job or a monthly salary. No matter what job you do, if you have a source of discretionary income, you can invest. If your income is low, but if you are willing to invest, you can reduce your extra expenses and invest with it. Invest with the amount of money that you do not need. You do not need a monthly income or stable income to invest, just determine whether you have a source of discretionary income. If you have a source of discretionary income and have basic knowledge about Bitcoin, then you can start investing.