This is a mint (field mint) plant grown from a cutting. I fell sick and couldn't water for two three days. Two of these dried and the last remaining one has dried edges and a light green appearance. Should I transplant this in a smaller pot for better rooting and oxygen supply? The pot is pretty big, almost 13~14 inches.
Usually I would recommend to always match plant size and pot size. However, you are dealing with a mint, so you can probably get away with just leaving it alone, for the following reasons:
First, mint grows and spreads quickly, so once it has recovered it will really take off.
Second, mint is fine even if the soil is overall a bit wetter, so one of the reasons smaller pots are recommended (quicker drying or absorption of water) is not that important here.
Now, of course you can transplant your cutting into a smaller pot, but you don’t necessarily have to.
However, looking at the leaves you seem to have a bit of a nutrition problem. It could be lack of fertilizer or issues with a specific mineral or ph. Maybe also an after effect of a dry pot. I can’t off the cuff diagnose what exactly is the issue, maybe that’s worth another question.