I am looking for volunteering works in either Manual or Automation Testing. I am a Salesforce Certified Administrator, ISTQB certified Tester. Could anyone please provide any information on the volunteering?
Try UTest. You will find paid and unpaid short term testing gigs, with a chance to test applications, devices, and workflows. UTest drives their testing via contract work and then crowdsources it with the most qualified candidates.
Also, you seem to have 2 good certifications for yourself, which can help you get better projects on UTest. Speaking of certifications, you should also go for Selenium 101. It will add more merit to your profile.