Here's my advice based on no experience at all, just boredom and lots of time to waste watching YouTube videos:
If you're shooting on a DSLR, and you don't know what you need, but you've got money to spend, then get two camera bodies (one FX preferably, the other FX or DX if you need to save money), and get a 24-70 f2.8 lens, and a 70-200 f2.8 lens. Take a single macro lens with you, and if you like take a couple quick primes for the shots where you really want specialized DoF. Get a capable flash setup, and have at least a couple of flash heads, and proper equipment for lighting.
The thing is that wedding photography, as I understand it, is going to differ based on a lot of things. Your style, for one, will matter. The types of clients you take on will matter too: If you're taking on a $10,000+ wedding ($10k just into the photography job), you'll need at least one assistant, and you'll need to really be on top of your game and know what you want and when you want it. If you're taking on a cheap wedding gig, you can get by more easily with simple setups.
I don't really know everything there is to know about wedding photography. I simply know the basics of what gear is worth looking at, and what you need to start looking at. Since you've shot weddings already, you should have an idea of what you want to bring with you, and what you have been lacking so far. I've walked by some pro photographers shooting weddings (at the beach, so after or before), and the things I've noticed are off-hand flashes, fast feet, and monopods.
In the end, it comes down to the jobs you take on, and how you like to do your job. I recommend you watch some YouTube videos where pros give you the run-down on what gear they use, and why they use that gear. It won't be the be-all end-all of what you use and do, but it will shed light into what you might be missing right now, what you can think about, and what you can improve on.
I'm spewing out information that I've simply filtered through. I'm bored enough to regurgitate what I've read about and watched.