Except in the situation of a new crisis, investing in an ETF won't help you much. The entire market seems quite inflated, ETFs are one of the causes.
Especially with something like what you mentioned - it's basically only American large cap stocks (Apple, MS, Amazon, Google, FB) and︀ by buying this fund you're basically expecting everything to grow infinitely. However, that may not︁ be the case - not just for 6 months or a year but even 10︂ or 15 years.
When something bad happens with US economy or the dollar, what will︃ be the consequence? I'm assuming from OP's naïve question thnx, but what is 60% -︄ USA large cap index funds and how can i invest on it.
that he is︅ not a trading expert. So the fund will lose 30-50 % of it's value, he︆ will panic sell at the bottom and half of his money will be gone.
Try to diversify - across asset categories as well as geographically. If you think a crisis︇ is coming, don't hold stocks like this - I cannot advice specifically but holding cash︈ (even ruble possibly) may be a better idea. There are many other asset categories (bonds,︉ metals, real estate, land, niche areas such as art).
There isn't some magical three letter︊ ticker that will make you money no matter what, at least you need to know︋ why you are buying it, having too much money isn't a legit reason. Do good︌ research and try to find value somewhere where others do not see it. In the︍ end, if you understand it, you may make many times more from buying and selling︎ rare LEGO sets than from buying "US large cap".
Also you can invest into your️ business and your education.
The debate of USD versus EUR is yet another story. Both currencies have their problems, American economy is fueled by dubious things, Eurozone won't be a nice place if the "slow part" (Italy, Greece, Spain) decides to separate from the "fast part" (Germany, France).
P.S.: Please do not buy cannabis stocks.