I also had TNBC, but early stage 2.
Did you have genetic testing? It is now indicated for all TNBC. I turned up the ATM gene and that helped to inform my treatment. I chose a double mastectomy and my chemo was taxol and carboplatin. I read that they now give some immunotherapy drugs during chemo now. I wanted the most aggressive treatments available.
I am doing ok and now 3 years after diagnosis. But, I hold my breath with every check up.