Do you need a new router? If your Internet is slow after upgrading to a faster service, and if your wifi range and reception is poor, or your Internet connection just generally misbehaves a lot, you might need a new router.
Even the New York Times, of all places, has published articles extolling the virtues of new routers. If your wi-fi at home is bad, they say, think about picking up a TP-Link Archer C7 router. I like the Asus RT-AC66U myself, but in my experience, and the experience of my colleagues, a new router makes a huge difference.
When one longtime friend upgraded to a TP-Link Archer, he told me his wi-fi improved so much his wired network was suddenly struggling to keep up with it.