Nowadays, a lot of mistakes are made in SEO as a result of wanting to attract more traffic to your website. Sometimes the reason can be misunderstanding of how SEO works or in some cases, the desire to improve very fast (which can’t be done when it comes to this topic) brings trouble so called-penalty.
It happens all of a sudden, there is no warning, and all of work is just gone from the internet. Your website is running smoothly, the number of visitors/subscribers and shares is increasing, the ranking is pretty high, but one day all of it disappears.