Hello Chemistry,
Thanks for posting the query here in this forum.
Currently, it was not possible to delete the feed in the activity.
However, you can filter your activity feed to reduce clutter and only see the information that is relevant to you.
See article: https://support.microsoft.com/office/filter-your-activity-feed-02b9ece4-6086-4daa-b4c0-627beeacbf08
You can upvote here in Microsoft Teams UserVoice, so that might consider it in their future update: https://feedbackportal.microsoft.com/feedback/idea/a51f4cb1-5553-ee11-a81c-0022484e5453
I hope this helps! Let me know if you have any questions.
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Best regards, Oluwatosin.