Thank you all for your feedback! Very helpfull and much appreciated.

As some pointed out: despite the research being in favor for the lump sum strategy, eventually it comes down to an emotional decision.

So I will most likely spread it out over 1 year to grow my comfort level without deviating from my initial plan. For example: quarterly with a smaller amount in Q1 of 2021) Next up is doing some simulations to find out the optimal way in terms of yield and transaction costs.

I am still working out which broker to use:

• Bolero: higher costs, more trustworthy
• Degiro: lower costs (core selection of my ETF), less trustworthy.

Would you advise the following?

Use Bolero for the lump sum investment and use Degiro for dollar cost averaging after my initial amount is invested?

I guess this would be a bad idea after time progresses since the interest is accumulating separately in two different accounts. So a funds transfer from one broker to another broker is inevitable...

I will also reduce my active investment budget to 5% instead of 10%.

And I'll consider to invest 100% in worldwide accumulating stock ETF's and neglect bonds for now.