I really want to stop relying on alcohol in social situations

Then allow yourself to get too nervous and have nothing to say, because it will be so. You will feel boring, and soon you will realise that the drunk people are on a different dimension in their minds and it's truly hard to connect with them...
Go through this fear, and let yourself be what you worry about being, boring, nervous, and remain present but also an observer to the situation. You will find your own insights.