Thank you for the reply. I didn't know about the payout issues, that's makes it understandable.
Steam would be great platform to boost it to a massively wider audience. However, through recent changes UK and german users will still be out of luck. UK requires now a credit cards (debit cards no longer works) and for german users the store page is inaccessible, because of a lack of age verification system. Nevertheless, I can confirm that already owned titles and redeeming Steam keys from Patreon, IndieGala, etc. still work. Maybe this could be a workaround at a later time - just a thought.
Alright, looks like Patreon is the only option for me then - even as an adult -.- I wish you all the bests on your journey through this time.