@e21cseu0141 Currently, there is no way you can publish an app using a PDI. However, consider PDI as a playground where you can practice a lot of ServiceNow related features for free. You can also build your custom app and showcase it to your potential recruiters to demonstrate your hands on experience and capabilities within ServiceNow

Regarding your job hunt you can refer to  https://www.servicenow.com/community/servicenow-jobs/ct-p/servicenow-jobs to know more about Jobs in different experience range.