If you built a lot toxic backlinks, you need to remove it by contact site owner or send it to google disavow tools. Domain Authority score is depend on a lot of factors. 
Posts made by zhavservice
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RE: Domain Authority Not Changed?posted in Moz Tools
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RE: Inaccurate backlinks being listed in Moz campaignposted in Moz Tools
@dxminds12 said in Inaccurate backlinks being listed in Moz campaign:
@jcn-sbwd Yes they should do something for the backlinks that have expired or no more available. Its really hard to find forum listing sites and business listing sites these days.