Second post in this forum.
I have no money for expensive strobes so I have to go strobist style and use cheap equipment.
Here's one picture from last year. I used 4 Yongnuo 560III speedlights in Supersync mode to overpower the ambient light.
EXIFs: Canon 6D | Canon 85/1.8 @85mm | 1/1250 | f/1.8 | ISO 100
Maybe a 4 stop ND filter is the better choice but in Germany I can't find a good an inexpensive nd filter. Normally I prefer the brand Haida. But there are just 3 stops.