WPA2 AES is safe to use. The AES option may be in another field near the WPA2 option. If your internet service provider supplies your router you may want to check with them.
Also see the following.
To eliminate the weak security warning, change the security settings on your router to WPA3 Personal, WPA2/WPA3 Transitional or to WPA2 Personal AES. How you do that varies by router. If you don't have the instructions for your router, do an internet search for instructions for your router brand/model or if your router is supplied by your internet service provider, check their website or customer support. Also see: Recommended settings for Wi-Fi routers and access points - Apple Support