Is it possible for metastatic breast cancer to be a chronic illness rather than death sentence? Looking for stories of hope

Recently diagnosed with MBC ER+/HER2- Has come completely out of the blue as no symptoms other than tiredness leading up to Christmas (which isn’t unusual). Have been on Letrozole and Ribociclib with monthly Zoladex and Denosumab injections and feel fine. But am terrified of what this means long term (I have 2 young children and am 45). Hoping to hear some success stories and people managing to get into remission x