I believe legalizing marriage, normalizing LGBTQ couples’ status first to prove the general society that they’re not actually some sick perverted sickos before we allow children adoption, should be the first step. Also waiting for the old people to die out, to put it bluntly.
Keep in mind Poland is still a hugely conservative society, in full grasp of the Catholic church. It’s changing, you can clearly see the trend, but on the other hand our current government is still actively painting LGBTQ+ as some sort of harmful ideology or what not. We have a long way to come.