Help me in reducing Bounce Rate in SEO

We are not getting Satisfactory Results from our current marketing team and therefore looking for professional team to handle SEO and Marketing work. 

 

We are not getting sufficient traffic on Website, though we are ranking well in top 5 position and on 1st page for many keywords example:

WordPress Development Services, Shopify Development Services and many more.

 

Still the Traffic and Session Duration is very less, Bounce Rate is more.

 

I want your expert suggestion and analysis on why the traffic is less and what best can be done to improve it. A Complete plan.

 

We are interested in SEO and Marketing Services for better organic results and genuine traffic and Leads.

 

We will start with minimum budget for a month and then we can increase our marketing budget.

 

Looking forward to your response.

 

Thanks,