Don't go it alone. Ask successful affiliates how they've grown their incomes - most are happy to share the details. Read their books, take their courses and get on their subscriber lists. There's no point in trying to reinvent the wheel. Simply follow the path that other successful affiliates have taken before you and you can achieve success too. It really is that simple.
Affiliate marketing is commonly confused with referral marketing, as both forms of marketing use third parties to drive sales to the retailer. The two forms of marketing are differentiated, however, in how they drive sales, where affiliate marketing relies purely on financial motivations, while referral marketing relies more on trust and personal relationships.