Apply elsewhere, other companies may be a lot of fun to work for.

I honestly think you should let go of this "dream job" idea as well. I'm not saying you shouldn't apply there again, but I think you need to stop idealizing it. Jobs are jobs. And even if you think you'll love a company you may not, even the best places can be full of shitty bosses and shitty coworkers or projects you may not like.

If you get a job at that "dream" company, then great! If not, that's also great! Find ways to be happy that don't revolve around work, because that's inevitably going to let you down.