I want to redirect a domain I have for about 6 months (new domain) to another domain I have owned for about 7 years (old domain).
Both domains have a completely different topic (niche), so I want to keep my old domain name, remove all the content on it and have the new domain content running in the old domain.
My questions: Which one is the best approach to do this:
Remove all the content in the old domain and permanently redirect new domain to old domain (at domain level). Do this at once.
Gradually remove the content in the old domain and also gradually redirect all the urls in the new domain to the old domain.