Upgrades maxed, what next?

[Zeryph]

I've maxed all hunting upgrades apart from time extend, and all auto upgrades apart from base damage and auto speed. I don't really click so I see no reason to begin maxing that out, at least until I start getting much more gold at a quicker pace. What upgrade should I be aiming to do? Extend my time extend? Base damage? Auto Speed? (even though I need AP for that...)