I think you're determined to be negative and say you have nothing of worth, despite so many people saying you may have.
Mid 40s isn't old enough where life can't change, but you seem very determined to say that your life will be exactly the same until you are no longer around.
Mid-40s I left my abusive ex when I thought I'd never get away
Mid-40s to now, my salary doubled
Mid-40s to now I met a partner so kind and caring I only thought men like him existed in dreams
Mid-40s to now my spine was diagnosed as broken, following an assault by my ex and I am now disabled and on daily morphine
Mid-40s to now I was diagnosed with PTSD
Mid-40s to now I learnt how much inner strength I have
Mid-40s to now I bought my ex-husband out of our family home to give my children security away from his threats
Life throws us curveballs constantly.
You could write a best selling book, get an inheritance, save a life, invent a cool gadget, change your career, become an influencer......Don't assume everything stays the same because it truly doesn't and you have to live with the good and the bad.
I hope life does improve in ways that you wish for so you truly feel you have a legacy to leave behind xx