I honestly think your plant is growing just fine, 67 days is too early to condemn it IMO, you won't see explosive growth at this point but you will definitely have your buds swell up more, get more dense and build their terpene profile over the next 2-3 weeks. Wait it out! Or don't lol, thats the beauty of it, you're in complete control 😁 if that was my plant though, I'd wait til at least half of those pistils curled in and darkened if you can't see your trichomes, if you can go off of those!