What a great post Sandro Volpicella.
I am using Scrapy it the moment which has a quite good price-value ratio.
In the past, I have used Semrush (which is still much cheaper than Ahrefs) but in terms in functionality it is unbeatable. I am pretty sure I will use it in the future too.
At the moment I am focusing on writing lots of great quality content using the techniques I have learnt in the past, making sure to achieve as little bounce rate as possible.
Later whenever I will use Semrush again, I will tweak my articles to have an even better SEO result. 😊