How can an SEO spamming score go down ?

According to SEO improve click through rate and decrease bounce rate.

Write good content and Don't publish content or links on low DA website.

The only way to reduce spam score by removing shady/spam links and get quality backlinks for your website. Avoid usage of spam sensitive words and phrases in your content, avoid HTML errors, unsupported techniques and obscure content.

spam scores are coming maily because of the high spam score backlinks to your websites.
you can reduce it by deindexing those links from your website using google search console. You can submit the high spammy score links after checking the spam score of backlinks from tools like moz.
once you remove spam score links, start creating high DA less spam, do follow score links. That will help you to improve your DA also.

Nine ways to reduce your website’s ‘spam score’ – and help to avoid SEO penalties
1) Avoid ‘dodgy’ domain extensions
2) Make sure you add the right pages
3) Don’t use a long, keyword-rich domain name
4) Include your phone number, email address and/or LinkedIn links
5) Get https
7) Avoid ‘poison’ words
8) Get Google Tag Manager
9) Get a favicon and Facebook pixel

Don't publish content or links on low DA website

It depends on the current situation of the site cause nobody knows well what is going in GooGle's Algorithm/

According to SEO improve click through rate and decrease bounce rate.

Thank you very much everyone

Reduce your bounce rate soon! Hurry

you write good content and easy to learn content

We can decrease the spamming score by posting content on High DA PA websites. Put new content on your blogs and not to post regularly instead of this alternatively