how to make my account super secured

i have alot of icloud accounts well apple id due to my phone being stolen and that apple id was logged in and i dont get how after going to apple and speaking on the phone over and over with a different device how can whcih this is my boyfriend that denied hes stole my phone and now he is able to accesss all my iclouds and has changed all my stuff due to passwords saved on that device plus he got a hold of my notebook with my iclouds apple id and passcodes and so its been a year now from broke. devices and hes under my name making purchases i havent accessed apple pay and he linked my card cant access apple music anything it just sucks how a person could do this and i never noticed but i got local authorities involved also my at&t global fraud department its just what can i do to make myself secure if he knows all my information and i cant make anymore apple ids its juat crazy even apps on my iphone 12 mini the apps will show a certain logo but when you click on it like for instance settings will be itunes and itunes will be apple news and its just annoying idk what else to do since law enforcement is doing investigation how can i get rid of spam malware and this software that doesnt sau apple software keeps saying apache.com or something like gstatic im tired of being heard on my calls i saw he made my old icloud email that was logged in into a business ordering things picking up stuff as a authorized used under my icloud its takin over my life its time consuming i lost my job but i want him not being able to see me from my stolen device on my new device him seeing everything im doing so please what can i download to keep my

phone so secured like how he did his which he wont tell me where it will let you know if its been touched lookee at what time and locked super secured so i dont have to worry and stress anymore. thanks please what app will be a good email locked as he made so many emails with my number when i call out my number calls someone else its like all my info is exposed all over