Is security level of VPN equivalent to WPA3 provided by TP-Link Home router?

need help with determining if my current VPN is on par with WPA3 provided by TP LINK AX1800 which is complimentary gift but doesn’t meet my need of two internet connections. Should I add a WAN switch such as ER-605 to an existing old router which cannot be replaced due to existing VoIP contract but has older WiFi protocol? And use my existing VPN on its outdated WiFi protocol? This allows me to sell AX1800 to partially recover cost of purchasing WAN switch. More expensive solution which is keep AX1800 and purchase WAN switch. Also is WiFi 6 not somewhat excessive when I already have VPN? And m

Question by sit123 on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.