Hi Daniel,
@melthetester wrote a great article on the Dojo about Learning through volunteering which might be useful for you. Off the back of her suggestions there I’d look to join the Ministry of Testing Slack and Testers.chat if you aren’t there already, there’s a Beta testing channel on testers.chat for sure. Some companies share their products on there to be tested.
Before the volunteering bit the post on here about Getting started in software testing might also be a good one for you.
Instead of volunteering maybe some sites to practice testing could be one to explore. Less/no chance of getting a bug bounty but there’s some great sites to practice testing on and some of them cover different areas of software testing such as automation and security.
Hope this helps,
Heather