Hi All,
I have a couple of potted chilli plants which have been fruiting for a while, but they are growing but are staying green. They then keep flowering and fruiting more and not putting the effort to ripen the existing chillis.
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.
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 :)