Cool, no matter if you play casually or seriously SIFAS is still such a great game and super cute. <3
Good to hear! The grind never stops with this game and there's always more to work towards. With SBL, as long as you're playing the songs in the event whenever you're able to, you'll get medals you can spend in the shop for the old event URs, scouting tickets, and a bunch of other things if you're looking for that.
Teambuilding and knowing what units to put where is a little confusing at first, I can try to help you out or offer a couple guides if you'd be interested? My main team's show power is around 12,000 and I can clear most Advanced Songs with that, so if you're looking for a certain amount for Advanced, I think anything between 9,000 and 12,000 is good. You definitely don't need Advanced songs to be able to tier, it just helps. As long as you have lots of skip tickets, you can just skip songs as long as you have LP and keep going off that. 80k in a couple days is really good, faster than I get them, and thankfully this game is super generous with event URs from rewards.
My username may be Setsuna but honestly, Ayumu is best girl. <3