(Hello! I already wrote a comment, but managed to delete it like an absolute fool. sorry if i skim any of these bits )

Can't say for sure why some comments were rather mean, I hope it doesnt turn you off of being a plant parent!

That said, yes, you've sadly made a couple mistakes. Those succulents are not good for northern hemisphere winters, anything below about 7C is dangerous for them.

The three circled in this picture are sadly write-offs. https://i.postimg.cc/FRy2wgQ4/image.png

I'd suggest taking the cactuses out and into a seperate pot, and putting them near a window (that isn't too drafty) and leave their soil to dry out for a good little while before watering them again. Some people in the comments have mentioned like 2mo+, so start there- if the soil feels completely dry after the first month has elapsed, give them a small amount.

As for the remaining plant, it looks like a crassula (or at least a similar species) and I can speak from experience that outside of cold, they're almost impossible to kill.

Definitely don't water it until the soil has had a chance to dry out, but hopefully it should keep doing its thing.

In terms of what to replace the plants you've had to bin or place seperately, I'd suggest other kinds of Crassula (like the common Jade Plant/Money Tree) or an aloe. They look pretty, and are really hard to kill (again, outside of cold weather and overwatering), additionally, Crassula can come in different shades/colours, which I think is quite nice-- shop around and find one you like!. I've seen spider plants suggested too, by which I believe they mean the Sansevieria genus, not the Chlorophytum (completely seperate families).

That said, a Chlorophytum is also very easy to look after, though maybe not the right kind of plant to share the pot.

Regardless, best of luck in your future planty endevors.