You can decrease your spam score by removing spammy links or just increasing the number of high quality links.
Let me show you a case study of my website. Recently I faced a spammy links on my website. then 1 did 2 steps to neutralize this. First 1 created high quality good links and then tried to remove these spammy links which is a little bit difficult. Evently my site spam score reduced from 20 to 5.
