gitgraph.js | convert git log -- graph to image with HTML5 canvas | Canvas library

Scenario:

• Created a Feature Branch From Master(Blue Color Branch)
• Made commits to it
• Later Merged with the Master and Deleted the Branch
• In between, I have created other Feature Branches and made commits to them.

Question: How can I get back the branch I deleted and unmerge so that the master looks clean without the Feature Branch (Blue Color)? I may need to add commits to that Feature Branch in future also.

I have looked at the following resources: Git undo local branch delete Git unmerge a branch

Do I need to do both of the above to get the desired result? Or do I want to create a new branch and revert the commits added in the Feature Branch and merge it?

I am completely confused and please redirect me to the right path. A sample Git Graph for the use-case is given below.

Note: There is no merge in between the Feature Branch (Blue).