Why investing in DeFi when there's Bitcoin and Ethereum to invest. With that capital, it is enough to diversify your portfolio with a few tokens and of course, Bitcoin will have the largest portion. Bitcoin because it is more certain compared to any other altcoins which are also less risky. Now that the market was slightly down it is the best opportunity to purchase some coins because they were cheaper. I wouldn't say DeFi is not worthy of investment it is just more volatile than Bitcoin which means higher risk to take but if you think you can handle it then why not it could be profitable as well. Just remember that scrutinize every each one of the coins before you place your investment for you to mitigate the risk of losing your money.