What to do after becoming free from suffering and attachments?
If nothing is left for attainment. Why would you ask anyone else to tell you to do , is this still not a form of an attachment to views of others ?

If someone is not interested in enlightenment or if it is not achieved then in particular ,  they would consider to promote and propagate  compassion and kindness amongst beings so that it could lead to path of partial fulfilment of end of suffering.