FTSE All world alone or complementary?

Hello everyone,

I am in the process of changing my strategy and therefore wanted to ask you how you handle the ETF selection or what recommendations you can give.

At the moment I am investing in the $VWCE (-0,1 %) as it already includes a wide range of stocks, both developed and emerging.

Would you also add an etf for small cap, value and emerging markets? Maybe a 25/25/25/25 mix then or the $VWCE (-0,1 %) as the core and then the remaining factor ETFs to complement/build around.

Would that be too much and make it unnecessarily complicated because the All world already covers a very broad range. Or do you think this is a good way to diversify.

Many thanks for your answers in advance.