Unlike Gold, Diamonds in Free Fire can't be earned in game. It has to be bought with real money. Therefore spending them wisely is a good choice.
Most of time players use diamonds and play a blind game, resulting into loss of money.
buying a booyah Pass can be a strategic move as it offers number of mechanisms to climb up in ladder.
If you have Boyaah Pass, then there will be plenty of items in your basket. Dont go on to buy new things.
Changing name with real money is the silliest thing to come up with.
No need to spend diamond on silly things, store them to use them in urgency.