I never drink when I go out. I actually don't drink at all and I'm 28. The way I get myself in a talkative mood let it be day or night, I talk to everyone! You're at a coffee shop, library, or mall talk to whoever. Make small talk. Another strategy I use is I will call one of my girls. It helps the juices flow
Now night clubs and bars. I have much experience and I tell the new guys I go out with the same thing, talk to guys! Social proof will pay off in the end. Show up a little early, talk to bouncers, and bartenders. Idk how many times I go out and by the middle to end of the night I'm in set and random people I opened in the beginning of the night come back around and slap me high fives other introduce me to new people. In the night club scene, I'm not very important, but you would never guess that when I'm out.
Hope that helps.