I once turned off the wiki now want to switch it back. Retry several times already, doesn’t work. Somebody pls help… 
Hey @reno.zhang, welcome to the GitLab Community Forum! 
Unfortunately, it looks like you’ve run into a known bug that I reported last week. I encourage you to give that issue a thumbs up, which will allow you to receive any updates on it.
To work around the issue you can still re-enable the wiki via the API. For example, the following API call would do the trick, just be sure to replace PROJECT_ID with your project ID and TOKEN with a PAT scoped for api.
curl --request PUT \
--url 'https://gitlab.com/api/v4/projects/PROJECT_ID?wiki_enabled=yes' \
--header 'authorization: Bearer TOKEN'
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