Finally got a decent salary, started investing in ETFs straight away… what now?

After a long period of study and countless applications, I finally managed to get a well-paying job a few months ago. I have used the last few months to settle outstanding debts, move and save up an emergency fund. I then slowly started to read up on ETFs and general investment strategies and decided to invest in what seemed to be the “Holy Grail” (Vanguard FTSE All World accumulating), €500 per month. What now? I have the feeling