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If you only have outbound links from your internal pages then that should be a major clue as to why you have poor "PA" Page Authority. You need to develop a concerted effort to "Earn" links to your content. Especially from high "PA" pages on high "DA" Domain Authority websites. There are a lot of ways to earn inbound links but the best way is to create great high-quality content that solves problems or answers questions. How about giving people a solution to a problem your clients often face. Create your solution pages to get people to go to and stay on your site. People will start to pick up the content and the inbound likes will start coming in.