I was drinking about the same as you, but for a lot longer. I stopped when I was told I had damaged my liver. It's coming to 6 years now, but my liver is still scarred, and could go into failure at any time, which would be a sobering thought if I wasn't already sober.
You can do this*. Plan ahead a bit, and pick a date to stop - not too far ahead, but enough time to make a date of it, and to get your wagons in a circle. The following suggestions need a bit of money thrown at them, but you can pick and choose, and they all have high and lower-budget options.
Make your bedroom as inviting as you can - nice fresh sheets, tidy it up and air it (all things that are easy not to get round to when drinking every night). Get some scented oil (you could get some lovely ones from Noom or Aromatherapy Associates for the cost of the wine you no longer drink), and an electric hot stone or diffuser. Invest in a good speaker or a sleep headband, and maybe some nice new pyjamas that you save for D Day. Get some non-alcoholic wine (the fake prosecco isn't too bad). Download some hypnosis and sleep tracks. Craig Beck is good (Quit Drinking), as is Glenn Harrold (Relax and Sleep Well), but find a voice that you find soothing. Then create a routine. Do what you usually do in the evenings, switching your usual wine for the fake stuff (the ritual of opening the bottle and pouring it into a wine glass can stop you getting twitchy). Have a sensible bedtime, and scent the room whilst you have a relaxing bath. Then get into bed in your new (or clean) PJs, and do some deep breathing before listening to your hypnosis or sleep track. You'll eventually fall asleep with a headband on or the speaker playing, although it's probably less likely that you will at first. Getting to sleep can be tricky, but if you make just being in bed as pleasant as you can, it doesn't have to be horrible. I don't know if the hypnosis worked or not, but the familiarity of the voice, the smell of the oil, feeling warm and comfortable in a nice bedroom all helps to make going to bed sober a good experience, and the fake wine deals with the habit side of things.
Expect to have to grit your teeth for a week or two. You may find that you sweat a lot, and feel a bit fluey. Whatever you do, take Thiamine (B1), as it can prevent brain damage, and doesn't work retrospectively. Read up on this. Multivits will do no harm, but definitely take the B1. Eat what you like. You might fancy sweet things, which is fine - you can diet later. If you feel a bit rough you can eat rice pudding or ice cream, which are comforting and likely to stay down, and will replace the sugar you used to get from the wine.
*this all assumes that you aren't physically dependent. I wasn't, even after decades of going to bed slaughtered, but you never know, and it can be dangerous to just stop. You could taper down before the big day, or speak to your GP. Mine wasn't concerned about withdrawal though - he just said to stop, and ran the tests on my liver. I hated going, but he (and everyone else I've seen in the NHS) has been kind, and non-judgemental, at least on the surface. I do enough self-flagellation - I don't need any more, and neither do you, so ignore anyone who tries to make you feel bad.
I second the Bright Eye suggestion. They are a lovely bunch on there. The only thing is that they are (IMO) a bit too non-judgemental when people fall off the wagon, and it can almost feel as though you need to do so to be part of the gang. There is far more attention given to people who post that they gave in to temptation than to the ones who grit their teeth and get through it, but if you bear that in mind, you will get lots of support.
PM me if I can help at all. Good luck!