Forgot to answer your other question my bad. Collab series usually always meet the meta demands for leaders, most of the challenging stages these days need custom tailoring of members to counter the boss skills, no there isn’t pretty much a generalized team. Collab material is still accessible via VPN, for example I still use TunnelBear or other VPN services connected to Hong Kong, Malaysia, Taiwan, Singapore etc. Being in the US doesn’t seem to be an issue, but since the migration of server the time has been set to CN time, so you’ll have access to a lot of stuff earlier. As far as server connectivity, I don’t have any issues and I live in California.
Do take advantage of the free draws the game is offering right now. It’s gacha and RNG but people still be pulling the jackpot cards in free draw lol.