The only thing you can do now is just hold. You didn't loose anything until you sell.
If you did the right thing and didn't invest money that you need, you'll be just fine next bull run
Even holding of ethereum is now dangerous because of the collapse price. I wonder how the holders of ethereum manage their losses and I guess most of them already cut the losses but some people are keep on holding. About the bull run its hard to know when it will happen again but I hope the bull right will happen again as soon as possible.If you did the right thing and didn't invest money that you need, you'll be just fine next bull run