Would the strategy of trying to connect with Ernesto De La Cruz be Miguel’s CF? Even if he got EDLC’s blessing, it would not have helped because they are presumably not family after all. And though this strategy leads to Hectors murder being solved, it also leads to Miguel being tossed into a pit.
...actually, that might be more in the OS? Maybe his strategy of hiding his music stuff is his critical flaw. If he had played in front of grandma Coco at the beginning instead of hiding Dante and his guitar under the ofrenda he could have saved himself a lot of trouble.