Try buying those mini bottles of wine and having one of those instead of half a full bottle a night. They probably only have 2 units in. Just allow yourself one a night then go onto soft drinks or hot drinks if you feel the urge to drink. They seem more expensive but will probably cost the same or less than a half bottle.
Or get those individual cans of gin and tonic.
Try getting the lower alcohol version of those smaller wine bottles some nights.
If you have 5 or 6 of those a week, one a night, you will at least be under 14 units. You might eventually get down to 4 to 5 a week which is better than your current consumption - maybe 8 or 10 units.
Drink plenty of water or soft drinks in between glasses of wine to fill yourself up with fluid a bit. Drink plenty of non-alcoholic stuff before you start drinking alcohol of an evening.
Also try one or two nights night off on a regular basis to start with where you drink nothing.
Don't stock up too much on wine.
Have the alcohol free day at the end of the week when you have drunk all your alcohol. Otherwise, the temptation will be there if it's easy for you to pour a glass.
My sister had a drink problem so she gave up completely and drinks fruit drinks and soft drinks, making them appealing with chopped fruit and ice.
I don't tend to drink more than a bottle a week, on most weeks (I don't drink every week). I try and drink lower alcohol wine, so 6 or 7 units. It's more than is good for me but I like drinking wine too so I understand a bit where you are coming from. I use strategies like the above to manage it, if I start to feel I am drinking more than I should.
If you like drinking then you may find it hard to give it up, but at least if you cut down from 30 units a week to 10 or under this will do your health good. Then your GP won't wince when you say how much you drink.