If like me, you are using an online bookmark manager, you might have a hard time, first del.icio.us died, i.e. was made read only when it was sold to Maciej Ceglowski who runs a paid clone named Pinboard.
Now it appears, the DNS entry for diigo is down, luckily, this means one can still access it if you got an api key using its ip address, hence one can use the https://mm-diigo-rescue-285.netlify.app . open source. no warrantee.
If you get an error message that the api is down with error 400, it is probably overwhelmed currently and should try again later.
After you copied and pasted the exported data into an editor, e.g. something like Notepad++ and saved it as a TXT file, you can ask ChatGPT to clean the dupes and supply an example export csv file of Raindrow as a role model to format the exported rescued bookmark list to.
In order to get such an csv file with correctly formatted saved bookmarks, make a new account with https://raindrop.io and make sure you add correct tags to the saved bookmarks afterwards (I saved 2 as sample), then export this and supply it to ChatGPT as comparison file.
Once ChatGPT did its work accordingly, you can download the newly and correctly formatted files with all double entries removed and properly formatted tags and import it into raindrop.io.
Voilla! Your bookmarks have been rescued! Once more….