You can be as bright as you want, cars will still ignore you and be brighter than you (thats why I have a LOT of high visibility stuff on my bike, reflectors, rear flashers and multiple handlebar lights)
Get a light for your helmet, its a great addition.
Also, If you are looking for a bike light recommendation, The lumintop B01 is good, and the way it works helps prevent you from blinding drivers (if that is your concern).
https://www.amazon.com/Micro-USB-rechargeable-flashlight-headlight-anti-glare/dp/B07WFDRPW8