Ketubah as prenup – how much weight does it really hold?

I really have no idea who to ask about this, as I am the first among my friends to get married and also for my relationship to fall apart :/ None of my relatives ever got married through the rabbanut other than myself, either.

I got married through the rabbanut in Israel, and in the ketubah my husband wrote that I’m “worth” about 180K NIS. What I understand from this document, is that it’s kind of like a prenup in case shit hits the fan. I don’t want 180K from him, just a reasonable sum for me to start over, because I moved abroad for him. The logistics conversation is obviously still ahead of me, but I’m trying to collect as much information about the process as possible, so that he doesn’t blindside me.

Anyways… How much weight does the ketubah really hold? Has anybody here went through a divorce from abroad if the marriage was done through the rabbanut? Would really appreciate to get any thoughts regarding this, and maybe any personal stories. I don’t know if I should contact a lawyer first here, or if I should find a rabbi.