Hey there, fellow Diablo player! When it comes to Paragon levels, my advice is to focus on balancing between core stats like Vitality, Strength, Dexterity, and Intelligence based on your character’s needs. Remember to invest in maximum resource and movement speed as well.

For defeating bosses, it’s crucial to understand their mechanics and have the right gear and skills. Make sure to have crowd control abilities ready to interrupt dangerous boss attacks. Also, consider optimizing your gear by prioritizing critical hit chance, critical hit damage, and elemental damage bonuses.

When it comes to efficient leveling, I recommend running Greater Rifts at a difficulty level where you can complete them in around 5 minutes. This will maximize your experience gain. Additionally, grouping up with other players can speed up the leveling process significantly.

Overall, always stay adaptable and be willing to tweak your strategies based on the situation at hand. Happy hunting in Sanctuary!