Need help secure my home network in a custom manner

I have Tata Fiber isp and using their stock Nokia router.
I have the strongest password set yet I somehow see unknown devices connected to my network and have to keep them blocking.

I have already assigned static IPs for all my home devices: bulbs, laptops, phones, tvs etc.

Things that I did right now:
  • Disabled SSID broadcast
  • Changed the password
  • Enabled guest mode

Looking to configure my router the following way without involving an additional router/setup:
  • I want to block IP assigning to any new devices connecting without approval or on similar lines.
  • Or reserve a particular IP range for devices connected on Guess network.
  • Set speed restrictions on Guest mode and time allocation like 2hrs 8 hrs etc.

The Nokia router, even I do a refresh doesn't show live devices while on Tata phone app it reflects all live connected devices.
Does Tata Play Fiber provide static IP in residential areas? I heard that it doesn't. I am ready to incur extra charges for it. Can you confirm?
 
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