If you've done all that and they're still partying, it might be time to bring in the pros. Particularly if you see signs of termites or bed bugs. Those are not "coffee chat" bugs. Those are "call the calvary" bugs.
But for regular tiny black bugs? You got this. It's a negotiation, not a war. They want food and shelter; you want them gone. Make your place uninviting. Be the grumpy host who doesn't offer snacks.
Final thought: You are not alone in this.
I promise, every single person reading this has found a random bug in their house at 2 a.m. and questioned their life choices. It's a rite of passage. It's the universe reminding you that you're not the only creature on this planet.
So grab that vacuum, a sense of humor, and maybe some caulk. You'll win this round. And if you don't? Well, there's always coffee. And maybe a rolled-up magazine.
Good luck out there. I'm rooting for you. (And maybe squishing a bug in spirit.)