If you are thinking about changing your blog address, there are some important considerations to make. It can be a big change to weather, especially when you are also rebranding your site dramatically.
There will be Consequences
Firstly, no matter how well you do it, you are going to have to suffer a dip in things like Domain Authority, and other rankings, but they should recover relatively quickly as long as you do the right things.
You’ll also lose some recognition when people visit your blog – if your new URL and name are quite different to your old one, it might be worth putting “previously XXX” on your blog somewhere prominent (but not overpowering!), so that people will recognise you. Not forever, but for a bit.
