Well, if everything that you’ve build is in a customization package already, you just need to export it from one instance (by clicking ‘Export’ on customization projects screen) and import in in another instance (by clicking ‘Import’ on customization projects screen). Then you need to publish the customization package in the new instance.
That’ll transfer the GIs, screens changes, reports etc. to the new instance. What it will not transfer is data.
If you also want to transfer the data, you’ll need to use ‘snapshot’ to export the data from one instance and put into another instance.
https://help-2022r2.acumatica.com/Help?ScreenId=ShowWiki&pageid=f2c286eb-e3df-4e6b-a0c7-a8dcedbee1d5