Rate my retirement plan

- Portfolio consisting of a single asset. Here the ticker: SPYI (Msci Acwi Imi, 0,17% ter, Ireland)

- 830€ monthly

- Time horizon: 25y minimum (Now I'm 25yo)

I will probably increase to 1000€ monthly in October.

Is it a solid retirement plan or maybe I could improve it?

I'm afraid that investing only on a Msci world is too good to be true and I should risk more, since I have a lot of time ahead.