Be patient. Most peppers take ages to ripen. Especially capsicum baccatum.
It's not uncommon for me to start harvesting in late September. If your clinate is not tropical and you don't have a greenhouse that is to be expected.
as I remember, serranos do not start turning red until the very end of the season and the plant is almost done.
Like the others have said, the ripening takes a long time. As long as the plant isn't dropping the fruits or they are rotting before ripening I would just wait patiently :)
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