I am at lvl52 in season with my Barbarian.

Where do I go from here? Should I be leveling in T3 or T4?

Is it proper to complete dungeons and strongholds first or am I missing something?

What is the best Barbarian build at lvl52?

Can I go with frenzy (favorite skill)?

Is it proper to add points to the big skills first, before I add to the small-passive skills?

Any help will be appreciated, thanks. GG!