Welcome to the Q&A Forum

by the way, website went live somewhere in 2015.

Thanks for the input. Agree with a lot of advise, but advices like the heading 2 tags is also good but shouldn't be the issue why it's not ranking.

https://www.buitenspeelgoed.nl/ is a domain acquired by our client. Previously this website was on http://www.buitenspeelgoed-keupink.nl. With the old domain they were ranking top 30 on 'buitenspeelgoed' in google.nl. Now with the new exact match domain they aren't ranking any more (for months). However, the website is indexed, as you can see on http://1l1.be/nz

I don't know what to do anymore. Need some advise. What we allready have done the last months:

• made adjustments to the 301-redirects (this was originaly setup wrong by the webdesigner
• (de) optimized the homepage on 'buitenspeelgoed' (strange is the fact that the Moz robot can't access the site).
• Checked the robots.txt to see if the website was blocked for Google
• Checked the meta robots to see if the website was blocked for Google
• Disavowed some spammy (old) links which linked to the old domain
• Checked Search console > Fetch as Google if there isn't any Malware of some kind (and to see if Google can access the site)
• Checked Search consol to see if there manual spam actions (isn't the case)
• Checked for duplicate content by copy/paste some texts in Google and see if any other results are showing up (isn't the case for most of the texts)

Please let me know what we can do.