Optimising my finance

Seeking best finance strategy on my current situation.

mortgage: $360k Offset : $220k Equity: $360k

I don’t have any personal loan, credit cards, car loan debt, do not contribute extra to my super, and do not own any shares or stocks. If I lived frugally I can save 5-6k a mth.

If you were in my position how would you be saving/investing with the equity or offset balance? Do I have too much sitting in my offset? Would I better off having the money invest in somewhere else with better return?