I think it all really depends on what you are looking for.

If you want to really gamble and do a super high risk high reward option you can start a majority of your investing money into bitcoin and other crypto currencies, like the above user said you can either just hold and go for a price increase or trade since the market has so many swings and try to grow your stack.

If you are looking for a passive income source you could look into real estate and trying to get different properties by saving and investing in them and keep repeating the process. You can build a really good nest and accumulation through stocks and investing in solid long term companies, compounding interest is your best friend here. In the end it all depends on what your investment goals are and how investing a majority of your money in one of these investment streams can help you get to your goal.