It is wise to write for a blog that has a similar topic or niche to yours so that the content is relevant. Even if you write a great article, the audience needs to be interested in reading it. For example, if you have an article related to the subject of economics and finance, it will not attract much attention if it is published on a blog that talks about religion. It may even be that one person or another will be interested, but overall, it will not be worth the effort.
It is a good practice, on these occasions, to send the owner a briefing of what you intend to cover in advance. If you can send at least 3 different topics for him to choose from, your success is even more guaranteed.
Compare the persona
If you want to reach the same type of audience gambling data belarus that you work with, who have the same interests and the same questions, the persona needs to be similar. Even if the topic is the same, it is very different to write about how to take care of health for someone in their 20s and for someone in their 60s, do you agree?
Write in a similar way
It's good to keep a style of writing similar to that of the author of the blog in question, because his audience remains active precisely because they identify with this type of writing. Of course, you can maintain your personality and have your own identity when writing, but don't do anything too different.
Have a portfolio to show
If the person is not yet familiar with your work, they will probably want to make sure that you have some knowledge of the content and that you have the skills to write a good article. Have some of your own texts to show them, if they want.