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Should I have a github profile as someone who wants to be a network engineer?
(self.homenetworking)
A community to help people learn, install, set up or troubleshoot their home network equipment and solutions.
I don't see a need for that in your field.
Posting scripts that work for your personal setup is actually something I would consider a security risk as it's giving details about your concrete infrastructure and configurations away.
You totally should add those netmiko scripts into GitHub.
What I do is stash the gns3 project files with my Ansible playbooks so if I need to run up a lab on another machine I have all the gns3 files and the relevant playbooks.