>>3265388No, I mean like 3 stage sharpening: RAW presharpen, actual/master sharpen, medium preparation sharpen
In PS I'd go Nik Collection Presharpener -> Camera Raw Sharpening -> Nik Collection Output Sharpener
Last sharpen only after resizing! Also do not go overboard though, only apply them ever so slightly...
Then I'd resize down to 1080 using the Preserve Details 2.0 with 100% noise reduction (reduces resampling aliasing)
THEN apply 2% uniform noise BEFORE exporting to maximum quality JPEG (Instagram compresses them again anyway!)
Main thing to do is make it "JPEG-proof" and noise does a good (great) job at that, like a rudimentary sort of dither at the frequency quantization step of JPEG compression
Sharpening as a whole is a misunderstood pp philosophy and done tastefully it brings out the details that are actually supposed to be seen at the final viewing platform/medium
. Presharpening resolves information lost in analog processes - edge-aware/Laplace filtered sharpen mask or any variation
. "Master" sharpening is the "creative" step where you bring out the details that your want - can use any other sort of unsharpen mask
. Output sharpening prepares for the viewing medium - think bringing out the details at all different frequency ranges for them to be seen at different distances/configurations - multiple unsharpen masks
Doing all this manually is awkward and cumbersome, so think about using plugins. Nik Collection is free it's been a while and their algorithms are primo
I created an Instagram recently, you can check some of the results - I process all the images the same (I only shoot analog though):
https://www.instagram.com/44.1_khz/ 
