Dear Koteshwararao,
In order to maintain highest degree of online marketplace security, every eBay user Account has a predefined activity - Buying & Selling- Limit. You can request to uplift the same by writing to our trust and safety team on inrswebhelp@ebay.com.
However, in case if you have not purchased anything yet and it is not allowing you to purchase anything at all, you require to report it to our trust and safety team at once. Our team will check and update you.