Preheat your oven to 325°F (165°C).
In a small bowl, combine the olive oil, sea salt, black pepper, dried oregano, dried thyme, and minced garlic to create a herb paste.
Rub the herb paste evenly over all sides of the pork shoulder.
Place the pork in a heavy-bottomed roasting pan or Dutch oven and cover tightly with a lid or aluminum foil.
Roast in the oven for 3 to 4 hours, or until the meat is fork-tender and easily pulls apart.
Remove the pork from the oven and let it rest for 15 minutes before using two forks to shred the meat into bite-sized pieces.
Warm the corn tortillas in a dry skillet over medium heat for 30 seconds per side until pliable.
Divide the shredded pork among the tortillas and top with sliced avocado, fresh cilantro, and a squeeze of lime juice.