We put together a "bitey box" for a 16mo who was biting. It was a stuffed animal, a wooden stick, a rubbery dinosaur, and a silicone toothbrush. He tried all of them out. He didn't like the dinosaur; he liked the stick and the animal but eventually settled on the toothbrush.
When he started to get frustrated, over-excited, or pushy, I'd tell him "Go get your bitey stick!" and he'd run go get the toothbrush, jam it into his mouth, and spend the next 10 minutes looking like he was puffing on a cigar.
It helped a lot--eventually he outgrew the biting, but until that happened the bitey box solved most of the problem.
And then his dad started showing him
The Walking Dead and he started biting again at 21 months.
Sometimes you're fighting a losing battle.