The most important thing is to start consistently, not the amount of Bitcoin. To start any investment, you should first have money, sufficient knowledge, or absolutely perfect market conditions.
Whether you are a pensioner, a student, a low-wage earner, or someone who has something in hand at the end of the month you can still be a successful investor in the world of Bitcoin—if you are consistent.
For those who have a long-term view of Bitcoin investments, the main objective should be to hold on to time. Whether big or small, this is your real capital. You need to see each day, each week, or each month as an opportunity—not in the light of market momentum or news. Small steps make a big difference in the long run.