You can always press Ctrl + A to select the whole workflow then, press Ctrl + C to copy and paste it in an empty workflow using Ctrl + V this is the quickest way if you want to replicate the same workflow.
Also, You can download your workflows manually using the Download option from here. Then you can manually upload it to GitHub or something.
Finally, You can use this Workflow (https://n8n.io/workflows/817) to save all your workflows into a GitHub repository.
Don’t forget you can also post workflow examples to n8n.io/workflows, @harshil1712 also has a list of community resources that you could submit your git repo to if you wanted to get more eyes on it.