Help me fix my iphone

Sorry, but adding more storage space on the iCloud Drive will not increase the storage space on your iPhone. However, it would help with your phone's backups.

As far as being stuck at the logo, see if the following article can help: If your iPhone is stuck on the Apple Logo - Apple Support

Yes, make a Genius Bar appointment at your local Apple Store or Apple Authorized Service Provider to have them take a look and provide you with your options. If you have been making regular backups, you should be able to restore without "losing too much data."

If you iPhone is able to connect to the Internet/iCloud, it should continue syncing. However, you still need to manage the storage space on your iPhone. See the following article for help with that:

• Manage your photo and video storage - Apple Support

See if this helps: https://support.apple.com/en-gb/HT201412. You can’t buy more storage for your phone.