as you said you have done few option so i suggest you to some more
ignore which you have done already 1&2
1) first open galaxy store>settings >disable marketing choice
2) set "never" to auto update app
3) go to customisation service >disable galaxy store from there
and whenever you update galaxy store or reset your device, and after that if you open Galaxy store you will get the option as i attached image, so untick all in recommendation and untick for marketing choice

