I know you were hoping to hear otherwise but there is no way to manually change your IP address. We use Dynamic DHCP which automatically assigns you an IP address on a recurring lease. It's possible you'll get a new IP address on your next renew but it's also possible to retain the same IP address.
Is there any reason in particular you want to change it?
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Getting a Router hooked up to your Hot Spot would definitely allow a lot more freedom in terms of the settings you choose.
Regrettably, upon further review, it doesn't appear to be possible to connect this device up to a router as it does not appear to have an Ethernet port to connect to a Router. There is a USB port but I am unsure if a Router can be connected through there.
If anyone in the Community is familiar with how to connect a Router to the ZTE MF970 device feel free to chime in!