“Unable to upgrade iCloud storage from 50GB to 200GB on iPhone: Seems like an old tedious problem. Just moved over to a new phone as the old one was broken. I'm out of storage and need to upgrade storage from 50 to 200GByte. Repeatedly says 'ping' and done, then returns to not enough storage. Yes I've restarted the phone.”
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New Apple Account Sign In:
Go in to Settings and then sign out of your Apple ID. Then, sign back in.
Clear Space Using my User Tips:
See if you need to clear lots of space. System resources may be using up too much services, making it overheat. Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support
So, what to do...
Clear Space, Using my User Tips: