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@Beautychicks have said it all but I would love to still chip in something. Sticking to your niche would help you avoid plagiarism. What is that subject or topic that comes to you easily? What talents do you have? Work on that. If you are good with poems or fiction stick to it and write as it comes to you. Most time people plagiarize when they want to follow what others are doing because they seek more upvotes but they do not realise that once you do that which you are good at, upvotes will always come.

If you know nothing about a subject please do not write about it. If you must do, read at least 10 articles on the subject matter. While reading make some jotting. With the jotting you can form your opinion on the subject matter and even if you must add some thoughts from the articles you read, at the end you will discover your post has a high percentage of originality then you can cite your sources.

Basically be unique and original and find your niche or talent. This will help you to make posts that are not plagiarized. In a situation where you do not have any of the above that become a vlogger and blog about your day to day activities. Tags like ulogs gives the opportunity of becoming a vlogger.

First ,originality is the key. Your personal opinion on what you are writting about matters. Don't write about what you don't understand.even if you have to research about something, its important that you understand it and explain it in your own way.

Putting your mind away from copying others content will help you a lot. Its not bad to get idea from others but understanding what you are finding solution to is what will help you to stay within your world. Just free your mind when writing, express yourself freely and before you know what's happening, you are done. You can write without plagiarizing. Start with something, just write about anything and see how good it is to express yourself without having to copy from others contents.