Thank you. That's what I thought and have been doing. What I thought more about is using Cloudflare's Bot Fight Mode in the free version of Cloudflare. Should I do that?
The best option is the cloudflare. The second best is, DNS fowarding. if you have a unique IP address, just use the same IP for your old domain.
The third best option is URL for forwarding. Most URL forwarding will not forward "https://" so the forwarding will break on browsers that automatically upgrade to a secure connection.