We should only untick unwanted apps from galaxy stores app and tap on continue on app recommendation page which appears after each galaxy store update while launching the galaxy store app first time after latest update.
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