Are ETFs Really the Key to Financial Freedom?

Don’t get me wrong, I have no prejudice against ETFs. I’m not saying investing in them is unreasonable. I’m just asking a question out of curiosity.

I’m a few years away from turning 30. I invest $200 in ETFs every month. Even with a long-term investment of about 20 years, I’m probably only going to make a net profit of around $50K (correct me if I’m wrong). My question is, what will this money really be worth when I’m 50s? With this amount, I can’t travel the world, buy a house, or live comfortably for the rest of my life. Did I really invest just so my money can double in 20 years? It feels like I’d have been better off spreading my money across unreliable coins, as that might turn out to be a more profitable move.