DNA Fragmentation Success Stories

Hi. After 2 miscarriages, we were told DNA fragmentation only. Not the other sperm tests as my wife has fallen pregnant every time we have tried. We have a one year old. I was terrified to find out mine was at 34%. I realise this is terrible news, however in the months preceding this, we had a holiday in blistering heat. I was drinking, eating whatever basically, on no supplements, and also pretty stressed/devastated from the 2 miscarriages which happened in this period. Is it likely I can change this percentage with no alcohol, caffeine, supplements, diet and exercise, and getting stress down?