these platforms are speculative in nature, you are not investing, a typical trading platform for example if you are trading oil you dont physically take delivery of oil
if you want to preserve the purchasing power of your wealth, then within the current environment, as an ape I recommend just throwing R10 000 in silver as close to the spot price as possible - no premium coins or novelties, as close to bullion as you can get. Take delivery of it and store it somewhere safe- its not a big amount so it should be easy.
for more generic advice, I'm not really inclined to give at this stage because the current economic environment is a mess, I would wait to see what happens when interest rates eventually start rising and then evaluate to see which direction to take
I used to be big on property and still am to a certain extent, but persistently low interest rates has created a huge bubble in that area- and other markets for that matter.