Is the Unifi Skyworth GN630V, able to become a AP ?
Possible but not really a proper AP mode for you to choose, you need to DIY it by connecting to LAN port, disable DHCP and configure a fixed IP.

If I buy one more GN630V from shopee can it become mesh ?
Can, but why do you want that, the performance is bad

Not worth it, try ask for swu, get transfer id from oher telco, and bargain with them.
Friend using 1gb said the same unifail is same as 100 llag at peak hour.
Generally i felt no different between 100 300 500 cause everyday i feels lag start from 7pm to 10pm

astro rm90 for 500mbps (although need bundle with astro channel package)

CelcomDigi rm90 for 500mbps / rm110 for 1gbps

Don't need one. I've just gotten my SWU5.0.
- I submitted termination like everyone else did.
- Received no response from Unifi.
- Proceed with Live Chat. Asked them to get a telemarketer to call me. Told them that I wish to assess if I still want to attach to UNIFI as my contract has ended. I told them my package was too expensive RM380++ (2gpbs Pro Upgrade + Ultimate Max Pack). Others are offering far affordable packages. No proof was given to them. They never asked one too.
- In less than 15min, received a call from the telemarketer. Settled with RM159 (6mths waiver, 24mths free speed upgrade to 1gbps, 6mths Disney + STD20).
- Done. Good luck to you.

I received SkyWorth sk-g7220 ONR. I change it to bridge mode and use my own router.

i just test again for you, SWU 5.0 500mbps RM90, include date time in screenshot