Focus on generating more money from your activities (better paying job, create a service/product that sells) and keep on studying how to adjust your asset allocation based on how much risk you need to take. 30/40k is only the beginning if you want to cover your expenses and more with your investments.
Back in 2016 I also did a lump sum investment of all my savings (a bit less than 100k at that time) and it did stay in the -5…0 % returns range for few months, I was doubting like you but had no better plan. Now if I look back I wish I had more money to buy stocks at that price (same in March this year), you will probably feel the same in few months or years. If not well at least you have a higher probabilty to stay above the inflation with future returns than keeping cash.
If that annoys you a lot that the boss of your savings is the stock market, you are not alone.
Another plan is to generate enough money that you can invest much more safely but that requires to think differently than showing up at a 9-5 job.
Good luck !