First of all, you have to decide on what exactly is your blog topic?
To make the correct decision just go by your own Passion.
The one topic that you are always interested in your life. Without being passionate about that topic, you can’t write a blog about it. I am passionate about blogs and blog creation. I love to see people like you, creating blogs by following my steps. This helps me to keep going positively without any setback.
You can blog about anything like cooking recipes, drawing tips, gadgets, technology, health tips, cricket/IPL, spirituality, Bollywood, Hollywood, photography etc.
Don’t limit yourself.
At the same time, it is also important to find a topic where there is generally a demand available or in other words, where you can find enough readers who are interested in that topic. This helps to quickly scale up your blog to a great extent and also, helps to generate a decent income from your blog in the long run.