How do you know what your weakest link is?

OP, you’re a bad boy for not sitting still while the dude with the Einstein avatar lured you in for another cut and paste lecture about how "everything matters."

You asked a straightforward and carefully worded question and you deserve a reasonable answer; if there’s more to your question than you realize (happens to me all the time), the civil thing for someone to do is have a conversation with you and try to find out what else is going on. Neither you nor anyone else deserves to be made into punching bag for "truth-bearers." They’re just sophists, anyway; best for them to move their hustle to another thread.

Your weakest link is the one that does not contribute any more after a major gear change. In simple terms upgrading your tt would bring a quiter ride and more stable sound. Upgrading your cartridge could bring a more refined sound with better info retrieval. Upgrading your phono stage could bring more air, better presentation, more dynamics. You have to balance all the above to see what you are looking for. 
My approach would be to go after the best table i could afford, then arm, then phono stage then cartridge.
All that depending on your lp collection and how far you want to go.

...and minor change.

@petg60 thanks for the insight as always. I may have a decent phonostage as I'm guessing and a table/arm upgrade may be in the cards. I refuse to get rid of my Hana ML though as I love this cart.