If XP doesn't offer a brighter headlight, there are many aftermarket options. Before you look into adding more lumens, it would be a good idea to check with the manufacturer for the max current capacity of the controller and bike wiring. It's very easy to over amp these components which could cause damage.
Headlights with built in rechargeable batteries are also an option which avoids the wiring issue.
I recently got an Outbound Lighting Headlight for $195 which produces 1800 lumens and has a cutoff for the light like a car headlight which is a very important feature to not blind other people on the road...a blinded driver cannot see you so it’s just as bad as not being seen at all.
So it all depends on how much cash you are willing to fork. Be aware of the no name brands that claim “1xxx” lumens for 20 bucks, the lights never come near the lumen rating they claim and the battery life on these fail really quickly.
Thing is about headlights is that to be seen you need to be brighter than your surroundings and to feel safe is a priceless feeling. I had a cygolite before my ebike and that was fine, but once I am going speeds up to 28mph I need better headlights and price comes with that.