I've kind of given up on cold brew, but only somewhat.
To start, I work at sbux, so I only get that coffee. It's ok, but it's free and I'm not making enough to warrant buying high quality coffee. I've only done it w sbux coffee, but my results were lack luster. It was too watery, no matter what coffee I tried and no matter how long a cold brewed it (up to 48 hrs).
I've taken to doing warm brew coffee. It's just as easy and tastes way better to me, my preferred method to drinking coffee really. Also, it might have more caffeine, for whatever that's worth.
I go with around 100* water to start. If you don't have a thermometer it's about 50:50 with room temp water and the hottest water your tap makes.
I have a food scale, it just makes life easier really. If ppl want to know the weight to volume ratio you could look it up or I'll make a measurement for you. Always 16:1 water coffee ratio for me, it's the standard anyway.
I also grind for turkish, but any fine grind should do (the reason I weigh it, I can compact it quite a lot, so volume is too inaccurate for me. plus, weighing on the scale means no measuring cup to clean lol).
If this is too strong for you, I've tried the same method, instead of leaving out on the counter after, just throw it in the fridge. Best of luck to you guys.