Buy a little bit of bitcoin every week don't care if it's a $1, $5, $10, $100, figure out what you can afford every week and buy it, get rid of unnecessary expenses or whatever you can think of getting rid of and spend it on bitcoin
5 to 10 years if you buy some every week you will be a multi millionaire
You can only start buying Bitcoin on the exchange starting at 10 dollars, not below this amount. That's what I know. But the advice I can give is that 5 years from now, it's better that we save Bitcoin, so at least it's sure that at that time you will have savings accumulated because of Bitcoin.
Then, after 5 years, you will gradually save Bitcoin again, or if you have extra money, you can also buy another cryptocurrency besides the Bitcoin you are saving. That's how prudent people are: just save as long as you have the opportunity to do such things.