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
I unchecked the marketing choice in settings menu. now it is not downloading any apps for sometime. is it ok or I need to clear data as you suggested. I primarily use galaxy store for only updating Samsung apps.
It is okay .I suggested clear data +force stop to instantly stop the downlod. Be careful while using galaxy store unwanted apps(bloatware) installation is common on galaxy store. Just untick the unwanted apps from app recommendation page and tap on continue as you have done now.👍