changing domain name - best practice to not lose SERP

Joined
12 Feb 2006
Posts
17,382
Location
Surrey
so in the coming weeks i'll be changing one of my business names from 123.com to abc.com

the structure of the site will change and the services/pages on the site some will have disappeared all together with nothing replacing them.

what would be the best way to not lose and of the value google have given the old site and have it transferred as much as possible to the new one?
 
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