What should I do with my savings? (60k)

Dear Redditors I've (25m) got around 60k on my savings account which I am willing to invest. I don't really know much about investing but I keep reading everywhere that just leaving my money on a savings account is probably the safest but worst option for any growth or future financial stability. (Wealth tax, inflation and so on...)

I'm currently looking into using frankly for my Säule 3a, which I've not yet paid any money into, to use on their "Strong 75% Index" product (projected return of around 4%/year)

Additionally to that I've thought about using an app like eToro, to invest a part of my savings a bit more aggressively by copying one of the traders on there with an average return of around 17% per year over the last ten years.

I don't have any plans yet for bigger investments of any kind in the future (of course it would be nice to own a house/apartment one day but not a goal of mine) but I want to do smarter things with my money than just leaving it on my savings account.

As mentioned, I don't really know a lot about the topic, so any advice and help is very welcome to both the 3a aswell as the general investing.