When we try to write something, we are motivated to express our feelings and encourage others to express the same feeling, our opinions, assertions, or desires.
You will be motivated by the willingness of others to tell you what you are, or you will be motivated by the willingness of others to agree (support, agree, consent) with your thoughts. If there is nothing in those minds, there is no need to write.
The first thing you need to do when writing is that you have to feel strongly that you have to write something and make it public. The stronger you need to write, the more you can be more aggressive in the actual act of writing, even if it is more tragic.
If we were to try to write a sentence, even if we were prompted by the need from the outside, what we had to do is to change that need from outside into our own need. This is not difficult. Think about what you want the other person to feel, what you want to convey, and what you want to preach.
To do this, I usually think of my surroundings, my interests, my work and occupation, my society, and politics. Strive to have a reasonable opinion.