I think this picture is only OK at best (in part because my tripod was a smashed down backpack) but I’ve never been good at getting pictures of fireworks that I think are even decent. I think this one is OK – low ISO, and a 4-6 second shutter. This one was at f/11 to keep the exposure in check and I might have been OK to bump that up (or down) a bit to f/16. I took some with 10 second shutters as well, but I ended up getting too much going on in one shot and the foreground starts to brighten up more than I like to get the fireworks exposed properly.
Picture taken with Sony a6000, SEL18200 lens @ 39mm, f/11, 6 sec shutter, ISO 100