If you have a background in a specific field, you may find there is a demand for writing industry papers in your area of expertise. For example, there are often adverts for doctors, lawyers, nutritionists, and business experts from particular niches, to write white papers on different subject areas. These are well paid jobs that you will need to stake your reputation on, but that can often be worked on from the comfort of your own home.
The next very important part of my overall strategy is to make absolutely sure that I pay the balances in full each and every month no matter how large they are. This should never be a problem if the cash has been budgeted for my purchases and secured in the bank. I have always paid my full balances each month ever since my very first credit card and this is why I never pay interest charges.