One of many ways to minimize unwanted insects is to make the birds feel welcome on your property. Birds have exceptional vision and can see colors very well. Try adding a ribbon of red, orange or pink to your bird feeder. You could also paint your birdhouse blue or your birdbath yellow.
Here‘s a little something I do to attract the first birds of the season, which have already started to arrive. Each summer I make seedless raspberry jam. I freeze the unwanted seeds in ice cube trays, then store in a plastic bag. When I’m ready to make a feeder I thaw a couple of cubes and place them within half of a juiced lemon.
Some other ideas are to "glue" bird seed to pinecones with peanut butter or stringing Cheerios and raisins with red yarn.