@winngggg Welcome to the forum! I will try my best to help.
Please note that you will only be able to import login items (which I assume are the items for which the “modelType” value is set to “Account”) and secure notes (presumably the items with “modelType” set to “Note”).
Are you comfortable with importing a .csv file into Excel, and using Excel to sort by specified columns? (If you need help with sorting in Excel, see here.) I would suggest that you start by getting rid of all Credit Card and Identity items (but first make a backup of your .csv export, so that you don’t lose the Credit Card and Identity information; you will need to transfer these manually). One way to remove those items would be to sort the spreadsheet rows alphabetically by the modelType column, then highlight all rows that have CreditCard or Identity in the modelType column, and then right-click one of the highlighted rows and select “Delete”.
Then, look for any columns that are empty (except for the column header) and delete those — e.g., by highlighting the empty column, then right-clicking the highlighted column and selecting “Delete”.
After you have completed the above, please let me know which columns remain. It should probably be just modelType, modelVersion, title, notes, url, username, password, and favorite, but please confirm. Also, please let me know if you still see two different values (1 and 3) in the modelVersion column, and if so, whether you notice anything different in the row contents for items with modelVersion=1 vs. modelVersion=3.