Here, something better than any flash.
If you just want light, get a Nikon SB600 if you need film TTL and digital TTL compatibility. Cheap, bonus points: CLS slave triggerable from on camera flash. If you dont need film TTL or dont need Nikon CLS, get a Godox TT685N. Godox has a superior radio trigger system compared to Yongnuo, with compatibility up and down their product line, including their strobes. These two are what I'd recommend to the pleb who just needs more light in their life. But take the time to flip it into manual for some real education.
If you don't need TTL at all, just manual, then maybe Yongnuo's 560 system is better. YN560IVs can be master controllers, and the YN560-TX is a cheap controller too. It's a bit better than Godox's manual speedlights, at least until Godox releases manual lights on the company's X 2.4 ghz radio system.
The Yongnuo flashes work on two systems: one for the 560 flashes, another for their TTL flashes (568, 685, 986, some other numbers). The Godox manual lights (433 MHz) can be made compatible with the X system (2.4 GHz) with the XT16 adapter. All of this is a moot point if you dont mind running around setting flash power one by one.
I dont work for Godox, I'm just salty about the Yongnuo system after buying a bunch of 560s and realized a 986 can't control them.>>3190238
Are you mad? A 70-300 IS or 70-200/4L will do fine for most sports, and an 85/1.8 for night and indoor. You can always rent a 100-400L for more range. The 400/5.6 is more than long enough, bring a monopod to steady the viewfinder.