The off topic notice should include option to migrate in the notice, and allow author to do it
103941
Allow users to migrate their own question
32889
Migrate to *any* site?
100528
Is an option missing in the new off-topic reasons?
77790
How to deal with old questions that are off-topic and cannot be migrated?
5309
Require minimum reputation on the target site for migration
94711
Opt out of moderator election notifications
46138
Can we get wordpress.stackexchange.com added to the list of off-topic redirection sites?
126766
Move questions between Stack Exchange sites
55811
Update Migration Path List for Non-Moderators
52671
Allow moderators to hide a revision
54445
Block migration if user is suspended/question-blocked at destination
143078
Is there a way to migrate a question to a SE site not on the "belongs on" list?
87230
Disable migration for questions older than 60 days
116814
How long can Moderator Resignation notices be featured?
24390
A migrated question's "newness" should be based on when it was migrated
133816
Why aren't all Stack Exchange sites available when flagging a question as off topic?
77173
Adding co-authors after acceptance