The more flowers in your garden the more pollinators will want to visit.
This can be done by planting flowering herbs in your vegetable garden you can help encourage pollinators to visit.
While you should keep your garden beds weeded to ensure that they have enough room for your plants to grow you should consider leaving the weeds in your lawn.
Many people do not think about hummingbirds, they think about pollination but these small birds are great for pollinating your garden and even eating all unwanted insects like aphids and ants.