Last year my fantastic Canon Twin Light macro flash gave up the ghost. It was going to cost several hundred pounds to repair, so I bought a Yongnuo ring flash. Obviously not as good as the Canon, but at approx £900 cheaper it's a real bargain. Yongnuo also make a ring flash for Nikon at £80. I would suggest you have a look
https://www.amazon.co.uk/dp/B0155VQY...ywords=yongnuo
Harry