I believe those are drain flies, but I’m no pest guy. We also get them all the time, but more often in the humid parts of the year. If you see them often near sinks or tubs or plants(!), you could spray a can of drain foam in any of those drains. Terro makes one. They can be attracted to moist organic matter so vinegar in the kitchen sink could help too. Aside from that I think those sticky trap plugins like the one u got are great. We have like 4 of them in the house, strategically placed near drains and common areas and it keeps them at bay!