I'm a shareholder of $HRPK myself but before you invest there you have to be aware that there are very frequent small capital increases but they massively dilute your shares over time (in 2018 there were 51 471 k shares, today 82 848 k, so an increase of about 60%, source: https://de.marketscreener.com/kurs/aktie/7C-SOLARPARKEN-AG-16783954/fundamentals/). Also, they had a leverage of 4.xx over the last years for a longer period of time and even if they reduced debt in the last years it's still a high debt in my eyes.
I was also invested but sold last year. It seems that a bottom is slowly forming again. With me currently again a candidate further up on the watchlist😬
What would be your reasons for adding it to the portfolio? What did you find out about 7c, what do you like about the stock? Since no one can see your portfolio->no one can say if it fits in there well