I need a bitcoin developer to confirm me if there's a way to convert the array of strings, which are the seeds, to private keys and then start checking if there funds on each address.
this is not how brute force supposed to work. you have to think about removing all the bottlenecks and optimizing the algorithm as much as you can instead of adding more bottlenecks. right now your work with "strings" and "printing them" are two huge bottlenecks that slow down anything you want to do.
there is also another step that you are missing which is checking the correctness of the checksum of each seed phrase before moving on to trying to create private keys.