Which SAP module certification is suitable after SAP PS Certification?

Hi,

I have taken SAP PS authorized training and got certification on last and immediately i got placed in a company as PS debut role. As requirement of PS module is very few nowadays,So i want to enhance my PS skills i.e. upgradation of Ps module to different module.

So can anybody suggest which module is best along with PS.

Regards,

Priyadarshan Samal