I don't know which country you live in and what the prices are there but in general with this small amount you cannot buy a lot of gold or land so it would be better if you could convince your parents to invest in Bitcoin instead.

Buying a small amount of $200-300 per month is not a large amount, but it will give you some good profits in the long run. You may get 3-4 times that when Bitcoin rises to a new peak.

It is difficult to convince parents of this new technology, but you have to make your effort and try.