How do I keep going when no one credits my work?

You make a whole property run as one, and no one seems to notice until it stops. Being the glue is like that. The better you do it, the more invisible it becomes, because smooth days do not draw attention. That is genuinely tiring, and you are right to feel it. Here is the hard, freeing truth. The credit you are waiting for may never come in the form you want, because the work is defined by not being seen. If your sense of worth depends on being thanked for it, you will stay drained. So move the source of that worth inside where you control it. That does not mean swallowing it forever. Protect your energy on purpose. Notice your own good work at the end of a shift, even privately. And where you can, quietly make your role visible to the one person who decides your future, not for praise but so it is not taken for granted. You hold the place together. Make sure you are not the only thing you forget to hold.