Need Help Setting Up two Isolated Networks with ZTE F6600 Router

I’m seeking assistance with a networking setup using my ZTE F6600 router. Here’s the scenario:

Setup:

• Main Router: ZTE F6600 (provided by ISP)
• Devices: Linux server connected to the main router
• Requirement: I want to share internet access with a family in the same building. To achieve this, I plan to use an access point router and an Ethernet cable connected to one of the LAN ports of my main router.

Objective:

• Create two isolated networks:
  1. One network for me (existing setup with the Linux server).
  2. Another network for the family sharing the internet.

Challenges:

• I couldn’t find a solution specific to my ZTE F6600 router.
• While exploring, I came across VLANs as a potential solution, but I’m unsure if my router supports this feature. I only see it when creating a new WAN connection. Additionally, I noticed a SSID isolation checkbox, but it seems to apply only to wireless WiFi connections.

Request for Assistance:

• Can anyone provide guidance on how to achieve this setup with my ZTE F6600 router?
  the two networks?
• If VLANs are not an option, are there any alternative methods I could explore?

Any help or pointers would be greatly appreciated. Thank you!