Kids don't automatically accept the idea of moving. So, you don't just shove your impending move and expect them to be okay with it. You should instead try to talk things out with them and make them understand why you have to move and how things will be once you've move into your new home.
Try to be as honest as possible so your kids will know that you are actually doing this together and that you are as stressed about it as they are. However, it's something that all of you have to do so you have to just have stick to each other during the move. Everything will be fine too once you've settled in your new place. Assure them too that you will have as much fun together as you usually do. Routines will be back to normal as well.
To keep their minds off the move, have them help out in their own way. For instance, you could task them to help you label the boxes. You could also let them pack their remaining things. And to make it more fun for the kids, give them their own small suitcase where they can put their favorite toy, favorite clothes, and other favorite items in.
Once you arrive your new place, try to unpack their room first so they can get accustomed to their own room. You can also let them pick their own decors so they will enjoy and love their own rooms.