Unless you want to print money in the far east or trade your life for money in the Locos, NEVER become a narrow body captain.
1. You'll fly to all the ****ty destinations, bad atc, wx.
2. You'll fly 100 plus hours of turns and nights month after month.
3. Your contracts will keep changing.
4.then finally the ever lasting risk that you'll become an FO again.
If you are going to stay In EU, upgrading would be the best choice as others have said .
If you are unhappy, and want to move some where else, especially in the ME, getting into a wide body rhs as soon as you can, would be your best choice. You and your family will be much happier.