What you have engraved is totally up to you, however please keep in mind that every item is different with some having limited space available to engrave. To avoid your engraving looking cramped, try to simplify or minimise the amount of text and add the extra words in an accompanying card.
E.g. Rather than 'Happy 21st Birthday Elizabeth love you , from all your family 23-08-2021, consider, 'Happy 21st Elizabeth' or even just their full name.
We can also replace words like 'Love from' with a small love heart ♥ , please indicate if you would prefer this