If you are making between AED 187,500 per year and AED 375,000 per year then you may register for VAT if you choose. If you make more than AED 375,000 per year, you must register for VAT.
For more information, please visit:
https://government.ae/en/information-and-services/finance-and-investment/taxation/valueaddedtaxvat
If you did not register for VAT, it’s always a good idea to keep good accounts just in case the policy changes in the future.