I hate that 'delete all cookies' advice shite websites give. It's lazy by them, it's unnecessary and shows complete contempt for people's wish to browse other sites without having to remember bank details etc.
I use this link: chrome://settings/siteData?search=cookies (can take a minute or so to load) and then use the search by name at the top right to pick only those sites that are having trouble
With Edge it's edge://settings/siteData?search=cookies