Certified GKH Gardening Expert
If you are hoping to have them bloom for the holidays, you can leave them for now. Some bulbs, like Amaryllis, actually do best in a crowded pot. If you are not looking for them to bloom soon or after they have bloomed, you can separate the bulbs from the mother bulb and repot them each in their own pot. It may take a year or so until they bloom again after that while they settle in.
You don't know what these are? Have they ever flowered? It's hard to advise you what to do when we don't what kind of plant you have. I would suggest you leave the pot where it is unless there's a hard cold on the way, then you can bring it in. An alternative would be to take in the bulbs for storage, but if the leaves are still green I wouldn't do that. If the leaves die back, you could try lifting and storing them. https://www.gardeningknowhow.com/ornamental/bulbs/bgen/preparing-bulbs-for-winter-how-to-store-bulbs-for-winter.htm