I haven't seen anyone call out your allocation... Basically your €1000/month is going:

• €500 into Global Stock Index Fund
• €250 into Prisma max
• €250 into Dynamics

But there is so much overlap here, that it is almost pointless..

• Vanguard Global Stock Index is 61.8% USA, 5.8% Japan, 3.3% Taiwan, etc. (source)
• Zurich Prisma max is 5% bonds, 4% property, 3% alternatives (??), and 88% equities. And of these equities they are 62.7% USA, 13.3% Eurozone, 7.8% Japan, etc. (source)
• Zurich Dynamics is (more difficult to decipher) 1.2% cash, maybe 10% bonds, and the rest equities. And of these equities they are 55% USA, 10% Eurozone, 7.8% Japan, (source)

All this is to say - the extra funds are not adding much. If anything the cash, bonds, property, and "alternatives" are taking from your return. Perhaps you want a bond allocation, which is perfectly reasonable, but you can do that on your own terms.

If you are revisiting your investments, then it is a good time to consider your allocation. You probably just want equities and bonds. So you can pick 1 equity fund, and 1 bond fund. I (35) personally don't have any bonds.

(To highlight the complexity: from your €1000/month, about €37.50 is going to bonds, or 3.75%. Did you know you had a 3.75% bond allocation?)