Not able to review cards

Hello,
I am glad I found Anki it has been very useful in my studies. Great app and great support.
That being said, I have a problem.
Yesterday I reviewed words at around 15:00, today I opened the app on my phone and laptop at 20:00, and it said I have zero words to review, which is strange. I changed the time when a deck should show up after reviewing to 0 hours after midnight, but it didn’t help. How can I get Anki to let me review the words every day?
I hope I was clear, if I wasn’t please tell me and ask me guiding questions and I will try to qualify.

What I am asking is, how can I make Anki to let me review my flashcards every 24 hours?

Anki is a spaced-repetition system, so it is scheduling your cards to avoid you having to study all of them every day. Anki's not showing me all my cards! - Anki FAQs

It sounds like you’re past the next-day-starts time, but that will only give you the cards to study if they are due today. They might not be.

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Thank you, what are the benefits to the spaced-repetition system compared to reviewing the flash cards every day?

You can start here: Background - Anki Manual .

And read this if you’re interested in more: How To Remember Anything Forever-ish .