Hi @Sandeep Goudar 

As without merging your previous company account to your personal account, you left , Here only option left -

1. Create a Servicenow account with your current (new) company.

2. Log into ServiceNow University with your current email address. Raise a case for assistance, refer to 

https://learning.servicenow.com/lxp/en/pages/now-learning-help-center?id=nl_kb_home

3. Support can help you to map previous employee ServiceNow account with your current company ServiceNow account

Note: One of my team member went through same situation. No worry. You will get all your certs in your new account

KB article : Merging my email (accounts),transfer certifications, badges to new email  is available for the guidance ,

Also Refer: KB0011832 Changing (updating) my email (account) 

                     KB0012564 Updating (changing) and merging my email IDs FAQ