Hi Alison. My understanding is that the Archangels placed a grid inside the Earth in 2011, and the ascension began in 2012. As for the fourth dimension, that is not a dimension to live in, but rather a kind of storage for thoughts and memories. It’s kind of vague for me to completely grasp.
I’ve written about both of these at length if you’d like more details. The Earth moving to 5D is called The Shift, and there are several articles that address it. Thank you so much for subscribing. If you have any further questions after reading older articles, please ask. You can also email me at asktheangels222@gmail.com. Blessings.