Maxed TFSA and RRSP. Next steps?

Hi all,

Looking for some advice here Wife and I both at 30 years old make about 200k a year combined before tax.

We have an emergency fund of 30k and maxed our both of our TFSA and RRSP on equities such as VFV and XEQT.

The question:

Our mortgage balance is approximately 550k and we don't have any other debt. We have about 2500-3000 dollars extra each month after our expenses. Should we work on tackling our mortgage at 4.5 % interest or invest the extra cash in non registered accounts? (We would be buying more ETF stocks such as XEQT and VFV). We are also open to exploring other ways to invest given that it is not extremely high risk such as meme stocks or crypto.

Thanks everybody for your advice.