Well I like them.
But as well as a shot you need a title like a cartoon in a news paper, the title needs to says it all in a few words, start with two words, four is pushing it...
The example is Weegee's 'Simply add boiling water' google of you don't know it if it was yours Id say add boiling water better.
And you need to look at each shot and crop, then ask other people is this the correct crop. Ditto for burning or dodging.
I frequently get the crop or emphasis wrong I show the whole print with crop options and burn and dodge gloss...
Your 5cm is long focus if you want peoples attention and
- people will look at you if you look at them
- some however will look at the camera whatever you do
- if you pull the camera up from waist level you will get a scowl or a smile depending on subjects attitude
- you need a deep hood even on dull days for minimum flare if you drop the camera hood helps the repair <<$, generic rubber ones are ok, and cheap.
An F3 is noisy and you may have to talk your self out of difficult situations, but sometimes I use a SLR like FM2n or F2, but mainly a Canon P though, which is quieter than a F3, and when the shutter fires it is in the can, as the cine people says.
My style is similar but mainly instinctive point, with 35mm E series or in street markets 28m /3.5. This allows you to work in closer, and get more context ie background.
You need to expect to spend all day in the street and maybe not see a shot you might want, and have a high probability of the subject being too far or too near, or mssing it, you need to concentrate and anticipate, what people are doing and what they are going to do next.
So Id start with a 35mm focused to six foot at /5.6 or /8 ... if it is too dark coffee shop. I need to blue tack lens focus rings to stop them drifting.
or 28mm at four foot /5.6 ...
But with a 5cm focused at 12 feet you have a wide radius and need to look over a larger angle and further away.
down and outs you may need to bribe with half dollar... post the shot.
Keep trying, ignore critics, unless they publish better, Weegee cheated, look at Garry Winogrand's shots, he worked in close.