Any amount you are earning today is 80% as a limit of what you know.
The richest man on earth is earning whatever amount he is earning due to the advantage of what he knows or can do.
So, before you can move from earning $100 dollar monthly to $1000 per month,
One of the major thing you must scale up is your knowledge.
So ask yourself, what should I know that can make me ×2 my monthly income?
Seek knowledge always.
I will give you an example that does not require knowledge to increase income:
A person works as a builder in his own country, he is a good specialist in his field, but he can receive no more than $ 500 a month. One day he decides to go to work in another country, where he can receive 1000 or even 2000 dollars a month for this work. He will do it without any new knowledge, he will simply go to a country with a higher standard of living.
Or another example, you opened a coffee shop, it brings $ 200 in profit, you did not receive any new knowledge, but saved up some money in a year and opened 4 more coffee shops and thus 5 coffee shops will bring you $ 1000 per month, no new knowledge simple scaling.
Sometimes it is enough just to act to increase your income, it is not necessary to back it up with your knowledge, although this will also be a positive thing.