@AbubakarNazeer
my website is Best B2B Genuine Buyer and seller provider [indiatradeport.com] also having the same issue . the website is 3 years old an still no work done for improving the Domain Authority and page Authority.
Only thing that can beat the Domain authority is your content. Write great content that your reader and customers love .Write intent full content. After following my words you will notice that your website get Topical authority. for Some topics even high Domain authority websites can not Outrank you. Write around the same topic. do not cover multiple topics if you are not a news website.