Keeping out street noise
Your best answer is to move. &lt;grin&gt;
Replacing the glass with windows designed for this can help, but IMHO they don't do enough to be worth their high price.
You could try exterior mounted bamboo slat sun blinds (they would be easy to raise and lower) But I think they would only drop it by 3-4 dB.
A better and cheaper thing to try would be to glue old carpet to the underside of the balcony above you.  Would look ugly as sin, but 2 foot long strips a foot wide, with 3 inches glued to the upper balcony, and the remainder hanging down would put a big dent on sound reflections.
It should be possible to create a device that has a microphone that you fasten to the outside of the window at the center, and a device inside that picks up the mike signal and vibrates the inner window out of phase.
While this would work for sound that is coming straight on, with the peak arriving at the entire pane essentially simultaneously, coming from below there will be considerable delay between a wave crest reaching the lower and upper part of the window.  (An 8 foot window is about 1/120 of a second corresponding to about 120 Hz (approximating sound at 1000 ft/s) )  To cope with this you would need to have a phase difference between the bottom and top of the window.

It's been/being done.
https://www.nytimes.com/2020/07/11/science/windows-street-noise.html#:~:text=Researchers%20in%20Singapore%20have%20developed,Nanyang%20Technological%20University%20in%20Singapore.
Denoise is selling them now.  But only claims 90% reduction.  That's about 30 dB  https://denoize.com/residents/  Costs are about 500 english pounds per square meter.  Window has to be replaced, not a a retrofit to existing windows.
However a search did not reveal anything as simple as what I described above.