As far as I know you still can’t “tag” items via Paper UI which means any Alexa items need to be created via text files.
Whether you need to delete everything and start again depends on a few things like do you want to publish all your items to Alexa or just a handful? You can have text based items and PaperUI side by side.
As far as moving to text files goes give these threads a read:
Second one goes a little off track maybe but still has many useful suggestions and tips in it.
