Move 1Password vault from old Mac to new Mac?
Yes, there's a much simpler way. In fact, you have a number of options, but based on your question I recommend the following:

On your new Mac

Do as follows:


Install 1Password on your new Mac
When it launches the first time you'll see a screen similar to the one below:





Select the More Options... option to reveal the Restore from Backup option.





Click on the Choose Backup... button
Navigate to where 1Password has saved its automated backups on your old Mac (if your Macs are not networked, then copy the backup onto a Flash drive first and use this for the new Mac)
Click the Restore button


NOTE: As mentioned above there are a number of ways you can do this. You may want to read the How to move your 1Password data to a new computer or device for other options.