Cant get my old domain

I need my old domain name back -
My old domain name is - phpguide.webege.com

Only a week before I jumped to the new site.
After I joined the new Site, I upload my website, but it gave me another new domain.
How to change it to the old domain name?

Thanks

Hi you can park your domain here using nameservers or cname records but only domains are allowed. Subdomains are not allowed here. So you can’t use your subdomain phpguide.webege.com here because webege.com is a doamin but phpguide.webege.com is a subdomain. You can grab some new free domains from freenom.tk or you can take cheap domains from hostinger.com

My new subdomain is phpguide.000webhostapp.com, I want to change it to the old one.
While I am trying to do that, it said the domain is already taken.
What should I do?

You can’t use your old domain here. Have you used it earlier?

Yes I used it before,
As I said, after got into the new 000webhost site I can’t use my own old domain.

So i got it. Your subdomain phpguide.webege.com is provided by 000webhost before migration. And after migration 000webhost have removed all subdomains like *.webege.com and now there is only one sub domain *.000webhostapp.com
So you can’t use it again. You have to continue with phpguide.000webhostapp.com

But when I saw about this issue in other forum, they solved it.
Hence I asked, so it is not possible to change it back?

Yes it is not possible