I also agree with you, I really suggest to invest into ethereum and bitcoin. Especially for ethereum because it is cheaper in price compare to bitcoin. And also I am so sure that these two will give a lot of profit in the future. We can rely on these two if we don't know which tokens we have to invest.
Now there is no such thing as not knowing which tokens to invest in, because now there are many websites and applications that can help everyone choose and see the coin or token they want, only for very common and very safe things, good choices are always there at the top position, this is very authentic proof in my opinion