If I were you I would do a Voluntary Dissolution. There are various steps that need to be taken including a newspaper ad.
If you do nothing you will be struck off eventually, but it is prefereable to go for voluntary strike off.
Will cost you about €300-€400 plus the price of a newspaper add - another €200, or you can try to do it yourself and only outlay being the newspaper add.
If you do nothing, you will probably eventually just be stuck off for non filing, however, it is not the ideal way to end things, if you want to commence trading or become a director again in the future.