I went through this process with my blog, changing from Entrepreneurs-Journey.com, a 10+ year old website with plenty of domain name authority, to my own personal brand domain name - www.yaro.blog.
We did everything by the book, carefully managing the 301 redirects, telling Google about the change, and despite all this my traffic dropped by about 50% after the change.
It did eventually climb back up about 25% more, but even now over a year later it's not back to where it was.
I think the answer is be careful and make sure you are planning to work on your SEO again after you make the domain name change.
Moving domains can make a tremendously negative impact on search engine rankings. This is because the major search engines use metrics on both the domain level and the page level to determine rankings. When a webmaster decides to switch to a brand new domain, they are resetting their domain metrics to zero.
However if done careful, will save you from the impact.
I researched a blog for you. It might help you curtailing the impact.
Please feel free to connect with me through a call, if you need my further assistance.
Hey! I help companies through SEO migrations like rebranding (moving to a new domain) and changing content location within an existing domain or sub-domain. The short answer is: yes, there will be a drop in rankings at the point of migration, but if everything is done properly, the ranking for pages on the new domain go back to where they were on the old one. The longer answer (with details and estimates) depends on a few things: 1) are you moving the entire domain or just a few pages? 2) how large is the site? 3) how authoritative is your old domain / new domain (age, existing external links)? 4) what's the niche of your site? Etc. Feel free to book a call if you'd like to discuss the details.