To start investing in 2019 some platforms are running bonuses and cashbacks, an overview:

envestio still has his offer of 5€ for investing 100€ and additionally 0,5% on all investments for 270 days!

estateguru use this link and get 1% cashback for all investments made from February 4th to March 4th! After that you get 0,5% for another two months (and me as well)

grupeer is still giving out 1% extra cashback on every investment made to Kviku and NordCard loans. (limited to February 5th)

new platforms I haven’t tried so far but might soon:

neofinance is offering 25€ sign up bonus

rendity also offers 25€ sign up bonus