Upvote:2
You can travel back to India with an expired visa from Poland.
It's your passport that permits travel to India; the expired visa does not have a bearing on your departure from Poland (only whether application for TRC indicates you have not overstayed).
I heard that we should exit Europe from Poland itself, meaning fly outside the EU and then take a connecting flight to India in such situation.
While you initiate your journey from within the EU, Poland, any connecting flight would have to be through a country for which you don't need a visa to transit, or for which you obtain a visa (either in advance or, if eligible, on arrival).