

For anyone who can access to Idyllshire, you shouldn't miss Wondrous Tails. You can get it after weekly reset from Khloe.
Below 16 images, see the button "Second Chance: 9"? Here is a few things in using Second Chance in Wondrous Tails so you can have higher chance to get at least 1 line.
In second chances, there're 2 choices: Repeat & Shuffle.
When you use Repeat, you can do 1 dungeon again but you will have to sacrifice a random undone dungeon, so use it wisely. It will cost 1 second chance for each time
Shuffle: Only use it when you have 7 stickers, use it until you get at least 1 line. It will cost 2 second chances for each time.
If anyone in the party haven't done that tail, you can earn 1 second chance.
There's no specific tips so I will give you some example. There're 16 tails in 4 lines, let talk about them:
1. 1st line: you can finish those with daily roulettes. Normally focus on lv50, lv60, l70 tails. But if the tails are lv1-49, lv51-59, you have less chance to complete it. If you complete lv1-49, lv51-59 tails, get a sticker from it, just leave it there and continue on finishing all easy tails. When you luckly pump into lv1-49, lv51-59 dungeons again, before you kill the final boss, make sure to use Repeat so you can get 1 more sticker from that dungeon.
2. 2nd line: They're raids, but the 4th image can be Aquapolis/ Lost Canals (treasure hunt portals), or Palace of the Dead. You can earn stickers faster by using Repeat if you have those.
3. 3rd line: 3 first images are easy with doing Party Finder and unsynced, you can use Repeat to do them again, but be careful, when you use Repeat, you will have to sacrifice 1 undone random tail, make sure it's not roulette tail.
4th image normally are Niddhog, Zurvan, Sophia, Sephirot ex which will be difficult to finish. Because there're many newcomers now, they might mess up mechanisms. Also, if you queue in Duty Finder, it's synced and has a chance to have newcomers. If you create a Party Finder and unsynced, it's long, and newcomers might come too. Just forget that tail.
4. 4th line: 1st image will be Niddhog, Zurvan, Sophia, Sephirot ex, forget about that tail.
Next 2 images are Bahamut raids, depends on which Turn, you can do it unsycned with your friends, but I normally skip those.
Last image is Frontline (PvP), you can try in Duty Finder, it's about 30m queue.
So here's what I normally was doing to finish my tails. I finish 1 roulette tail, do 3 trails in 3rd line, then use Repeat to do 3 trials again, so I get 7 stickers in total. If I'm lucky, I can earn Second Chance. If not, I get 6 Second Chances left. I can use Shuffle 3 times. If I get 1 line, I stop and use Repeat to do easy trials again to get 9 stickers, or I just do Frontline and any tail dungeons in 1st line. Therefore, I finish my Wondrous Tails in 2 days.
If you don't want to waste Second Chance on Repeat, then just do all tails, lol, but it's troublesome.
Hope it helps, have fun with Khloe ;)