Unfortunately, while you could put an increase anywhere in the row, I think it will look off because of the pattern.
You are likely loosing stitches because you are forgetting to do the YO or the YO is sliipping off the needle before you do the next k2tog.
The pattern as written is supposed to create alternating holes with thick (k2tog) sts. If you mess up and try to correct it, it will just look off. You will see where the mistake was. You will see where the correction was added.
That being said, if you really don't want to tink/frog back and you want to try to correct this, I would add the extra stitch at the end of the row by either omiting the k2tog and just doing a k2 or doing a M1.