Also, know what makes your character work. The best Punisher season was Daredevil season 2. Because Frank operates in the shadows. You get a couple of good scenes to explain his backstory and philosophy,
"You hit them and they get back up, I hit them and they stay down!"
But for most of the series, he's just wrecking shit. The Punisher isn't really a complex character: he's basically a serial killer who's redeeming quality is that, instead of killing innocents, he preys on people who are much, much worse than him.
When they gave Frank his own Netflix series, they made the mistake of trying to humanize him. He shows emotion, has a one night stand with a woman, treats the teenager he rescues like an adopted daughter. That's not the cold-blooded sociopath from the comics we all know and love. You don't have to make Frank a nice guy. Just find the worst scum imaginable. and turn Frank loose on them. The enjoyment comes from watching the Punisher fuck their shit up.