Passion is one thing, but can you monetize the niche you picked? You need to make sure whatever you decide to write about will make you money. And if making money is your ultimate goal (and it probably is if you are reading this!), you need to pick a niche that will allow you to make a profit. And this sometimes will have to overcome your passion.
It is highly unlikely that a fashion and beauty influencer account will ever publish anything other than that subject on their portfolio. Hence, mutual relevancy between affiliate and brand is of the utmost importance in Instagram affiliate marketing. For this, it needs to be evaluated if your posts will fit into a person’s feed and that the audience will enjoy it. This requires rigorous searching and going over every detail in every single post the affiliate has made so to find relevancy for a brand or product that is to be marketed on their platform. For influencers, this means that you should be equally choosy among the affiliate products that you represent so that they are relevant to your community because you are what you tweet.

Another big player in the niche of outdoors and hiking is one of the biggest names in outdoor equipment hiking in the world; Coleman.
For the majority of affiliate programs, you’ll just need to register an account. There is no approval process needed except for providing the right information. Every program will ask you to provide either a social security number or an EIN (Employer Identification Number) during the registration process.