Hey,
After destroying the first shard there will be no more waypoints in the quest until you're very close to the next one.
Try looking around the Well of Infinitude to see if you can find the shards. Alternately, you can use a guide to point you where to go.
If the shards still don't appear, could you post a video showing the places where the shards should be. You can upload it to a public sharing site like YouTube and just leave the link here.
English
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Thank you, after a couple of attempts it worked and I got the next step of the quest.