What should I invest in other than FTSE all world?

I have a lump sum of 50k euro I want to invest, I was planning to put it into FTSE but researching brought me to question if I should diversify even more by adding QQQM and SCHD to the mix with a 50% 25% 25% split or even less for the other two.

It's my first time investing and I want to make thw right choice.
Thanks!