Target file are very huge and running out of storage on mac.

I work on a couple of rust projects which are quite big and whenever i build them, the target files becomes so huge that they go above 30-40GB. i mostly work on 3 rust projects and all their target files combined exceed over 100GB. I have a Macbook with only 512GB storage. Should i use an external SSD and transfer all the other folders which are not used often to it? I wonder what i can do so that i dont run into storage issues often.