Just about to read @tomasz86 information. I didn't realize anything would be lost during the export/import. Losing history is understandable.
UPDATE:
I just exported a bunch of notes that had tags in them and then imported them into another profile and the tags were still there it did not drop or delete the tags.
However, I would hate to lose tags.
If that is a concern, then don't put the original notes in the notebook that you're going to transfer to the other account, make a copy of them And transfer that so that you preserve the original folder and notes. I just selected all notes in a single notebook. And I was presented with the opportunity to duplicate them. And unfortunately, it put the word copy at the end of every note. You don't want that unless you don't care if the word copy is added to the end of each note.
I tried something tricky that I wasn't sure of so I tested it. I exported all of the notes that had the word copy in them and then I edited the exported file and did a find and replace removing all of the word copy and then when I saved it and tried to import it I got an error saying that there was a check some error so you can't go in and do it that way.
Just so I have an idea approximately how many notes and notebooks are you looking to move from one location to the other? If all you're moving are a certain number of notes in each notebook even if they're in the numbers of 200 in one notebook you can highlight all of the notes in a notebook or say half of them and then export that half and then import it into a new notebook.
I just upgraded my video recording software so I have to reboot my computer now. I will try and make a brief video explaining how I would approach your situation only I don't know exactly how much quantity you are looking to move so my instructional video will be short and give you some ideas.
If everything you want to export is already in one single notebook in the source profile, exporting to a file is not going to alter change or delete in any way. The notes that are currently in the source database. then you can import them into the other profile and they'll be exactly the same.
If you would rather select individual notes inside a notebook you can select 20 of them and then export all of them into a file that you can import into the other profile.
I also moved or actually am in the process of moving from evernote to Joplin.
There is a very nice program available that exports your entire evernote. Database into a single file and then from there. You can export that single database file into all of the notebooks that you had in evernote. All of the notebooks will expand into one folder and then Joplin can import that folder and reimport. Or import all of your ever note notebooks. So there is little risk of losing your original data.
Evernote backup software to export entire evernote data store
I tried something tricky that I wasn't sure of so I tested it. I exported all of the notes that had the word copy in them and then I edited the exported file and did a find and replace removing all of the word copy and then when I saved it and tried to import it I got an error saying that there was a check some error so you can't go in and do it that way.
Just so I have an idea approximately how many notes and notebooks are you looking to move from one location to the other? If all you're moving are a certain number of notes in each notebook even if they're in the numbers of 200 in one notebook you can highlight all of the notes in a notebook or say half of them and then export that half and then import it into a new notebook.
I just upgraded my video recording software so I have to reboot my computer now. I will try and make a brief video explaining how I would approach your situation only I don't know exactly how much quantity you are looking to move so my instructional video will be short and give you some ideas.
There's also a plug-in that is highly recommended for those moving from Evernote because Joplin Imports Evernote links from onenotebook to another r notebook but doesn't do anything with them. There is an extension for Joplin that will go through and fix that so any note to note links and you had will be recovered. If you need that let me know and I will post the information. It's a Joplin plug-in. I think it is called bidirectional links.