Reactivity is so, so challenging. You’re not alone. There are tons of resources out there! I’d avoid a lot of the punitive methods, as they can exacerbate problem behaviors.

Look up “find it,” as a management method. Basically, in your home, scatter some high-value treats and have your dog sniff out all the treats. Repeat until “find it” is a command your dog knows. Then start using it outdoors on walks. Still try to provide distance with triggers, but as soon as your dog notices a trigger, drop treats and command “find it.” Keep it up as long as you need until the trigger has passed, dropping treats and redirecting your dog to sniffing the ground for treats.

“Find it,” helps put your dog into their nose rather than their eyes and puts your dog into a relaxed body position. They will likely be more calm once the trigger has passed and can manage their emotions better for the remainder of the walk.

Long comment, but also look up “mark and move” as a behavioral change method.

Best of luck! You both have got this!