How do I keep humidity high in a big tank?

So ive got a 6ft x 1.5ft x 1.5ft enclosure. I literally cant raise the humidity and im spraying inside everywhere alot. The lid has holes about an inch apart. What do I do?

That's a big enclosure.
What are you keeping in it?

Cover as much of the lid as you can while allowing some airflow to be maintained.

What are you using for substrate?

Do you have more than one water bowl?

Many things can be done. It would help to see what we're working with.

Photo would be great.....

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