...for fishing in mid-July I understand from what I have read that fishing can be hit or miss
True, summer can be a challenging time. Hatches can be sporadic or non-existent, and/or theres not much abundance other than staples around.
Just my opinion, but that's a good time to pull out the attractor patterns you have the most confidence in. Leeches, woolly buggers, spratleys, scud, damsels, dragons, boobies, blobs or whatever you like. They still have to eat, but if they're not keyed in on anything specific, it seems they can be inexplicably picky and you just can't predict what may or may not entice a take or get refused. Mix up sizes and colours; just because you caught one one fish on a particular pattern doesnt mean other ones will want the same thing. If you can use two or more rods, put something different on each one.
Dont rule out chironomids, as you never know. If you see surface activity, definitely try some dries.
Throat sample when you can, and if there's something prominent in there, might as well try to match it. If it's empty, a random mix of everything, or just daphnia, then continue to work those attractors.
Use your sounder (if deep enough). If you're not marking much, move (or troll). If you see fish on the sounder try and get the depth of your presentation dialed in. Of course you want to do that in general, but I feel that's doubly true during doldrums when they may not be particularly aggressive and don't want to work too hard.
On the plus side, it's usually a lot less busy by then, and while you might have to work harder for success, it feels extra rewarding to be able to scratch out fewer fish in tough conditions.