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. 
Latest 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.
The service group of Zhav Service is ready to provide all kinds of services to its dear customers with its experienced staff. We hope that we can solve your technical problems as soon as possible. Leave the repair of your home appliances to the representative of Zhav Service. 
نمایندگی خدمات ژاو سرویس با وجود کادری مجرب و کارکشته، آماده ارائه انواع خدمات به مشتریان عزیز خود میباشد. امید است بتوانیم در کوتاه ترین زمان ممکن مشکلات فنی شما عزیزان را رفع و تعمیر نماییم. 
https://zhavservice.com/