Get a Good Photo Editor
If none of the previously mentioned methods work out, you can always try to fix a too-dim shot “in post.” While the built-in editing features in Photos or Instagram are fine, we recommend downloading a high-quality photo editing app.
Snapseed or Adobe Lightroom are both good options. As far as what you should do to a photo, try messing around with the brightness, contrast and noise reduction features. These all can result in a shot that’s Instagram worthy even if it’s originally too dim.