You can check up-for-grabs.net/#/ and find an issue that is free and easy for you.
Another way is to find a project and open an issue that also you will resolve if contributors are ok.
For example, I opened this issue and it was one of my first contributions.
Also, I made an npm package mockingcase and created over 10 issues that were resolved by 13+ pull requests from contributors. Maybe you can suggest a feature or resolve an issue which is available.
For further actions, you may consider blocking this person and/or reporting abuse
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You can check up-for-grabs.net/#/ and find an issue that is free and easy for you.
Another way is to find a project and open an issue that also you will resolve if contributors are ok.
For example, I opened this issue and it was one of my first contributions.
Also, I made an npm package mockingcase and created over 10 issues that were resolved by 13+ pull requests from contributors. Maybe you can suggest a feature or resolve an issue which is available.