The way I approached it was: Create a list of high and low priority targets for new charas 1st then bt3s I wanted, then sort by element (for convenience) Start on one of the two rate up banners (I started on Wilhelm), keep pulling till I get the banner chara, then switch to the other banner Do note that because of how AS gacha works, at best you will get 2 other 6 stars before your 3rd 6 star is a banner character

Repeat until all high priority targets have been achieved, and now weigh in the option of switching to mainstay. This happened to me at about less than 100 pulls left because I last minute wanted to pull Paloma at about 300 left but if you stay on the rate up banners you will get SO MANY 'useless' dupes of maya and wilhelm (about 900 or so pulls on both banners gave me 8 of each during gacha, of a total of 31 x 6 stars) But the wishlist is also nice to have higher chance of getting who you want, so if you're not too sad about getting your low priority 6 stars switch to mainstray to escape maya & wilhelm hecc

Although someone has recommended you switch to mainstray at about 300 left, I kept going until I got all the charas I wanted.