If you have tried to make money before and failed, I commend you on your attempts.
With busy lives, the last thing anyone feels like doing is making effort to make money in their own business, but those that do, the success rate is not very high, but the success rate of those that want to but never even try is zero, so compared to that group you are in good company.
To answer the question, how can I make money? we have to consider what you want to do and how you want to make money.
You can get a job in a copper mine and make $2000 per week digging for copper but would that suit you? Would you be suited to working 1 mile under ground on a daily basis in dirty clothes and a suffocating environment.
This may suit some people who may find the experience enjoyable while others could not even do it for an hour much less make a career out of it.
To answer the question above, I need you to think about what sort of activity would suit you.
One such activity that is possible is for you to stay at home and work from the computer.
This would suit nearly anybody wouldn't it? Possibly, but some people need daily interaction and would feel just as suffocated as if they were working in a copper mine, so it is not for everybody as you will have to motivate yourself and work a solitary environment.
To answer the question how can you make money, you have to consider the environment you would like to work in as much or if not more important than how much money you can make but it is all relevant that is true.
What ever route you take it has to be a sustainable occupation that keeps you interested and therefore you will stick with it which is how success comes.