how do i get 600 catfood fast

ok so basically i have trixi in 20 rolls, and i have 9 rare tickets and 860 catfood
if i can get 640 more catfood i can get her
so i basically have to beat like 11 chapters of starred ul
i'm already done with all of starred sol, all of the maps available right now (except machines in revolt but i will have done that soon), and all of 2 starred ul
so basically, either i get a lot of catamin as (still going to have to do a couple ul subchapters but i can at least do most of the manics' catamin stages)
or i complete 11 subchapters of 3/4 star ul
i've beaten aac and aku altar's seal on both 3 and 4 star, here be dragons through barking bay 3 star, and humanity catified + revival of origin in 3 star
so pretty much i came to ask what are the easiest subchapters of 3/4* ul
and no i'm not doing moodist beach don't even bring it up, fuck stars in the tumbler
oh and also i just have multitetrapod left in marine ministry 3* and murmuring evil and the next stage in abyss gazers 3* so

unless there would happen to be a discount reset right after trixi leaves