Should I diversify further with a small cap ETF?

The title says mostly all. I’m currently investing in an ETF that follows a MSCI world index, invested in a single ETF only and I’ve been investing for about a year and a half now (around 1k€ monthly). I’ve been reading a lot about small cap ETF’s, especially the newer ones from Avantis. What are your opinions, should I diversify further? I don’t have a large sum invested yet (under six figures). submitted by /u/Southern-Spring-9569 [link] [comments]