I'd suggest branching anew from the latest develop then adding the few refined tweaks discussed here that make sense to commit, then new PR :-)

At times you can just add more commits that tweak at earlier stuff, but then even if you've reverted all changes to a file it still ends up flagged as changed, though many tools will quietly ignore it / hide it for brevity. 

Can also rebase /reset to completely undo some changes but that wrecks havoc with existing PRs (and utter chaos if something else has branched off the old state) so usually it is better (and easy!) to rebranch