Hi there @grandeurzone! Welcome!
That's a big question. It's hard to know for sure without looking at your account and knowing your strategy. Can you drop your Pinterest profile so we can take a look?
At a quick glance it looks like you could use keyworded board descriptions. I would also get rid of all of the board sections. Sections are not meant for marketers. They become a hurdle for pinners to get to your content. Instead, you could make most of those board sections their own boards. Make sure they are keyworded and specific.
Also, and likely the biggest reason for your drop, you should start implementing Idea Pins into your Pinterest workflow! Idea Pins are the top prioritized pin format on Pinterest. So they go to the head of the line in the Pinterest algorithm!
If you would like a step by step walkthrough of Pinterest marketing for beginners, you could sign up for this mini email series https://www.simplepinmedia.com/start/
Hope that helps!