In your garden you can have a great positive impact on local pollinators. Leave a portion of your garden grass uncut and let the flowers grow. What you may consider to be weeds are important food sources in the eyes of butterflies and bees. You could even plant pollinator freidnly plants around the borders of your garden.
Making a bug hotel for insects (not just pollinators) will help encourage more into your garden. Perhaps leave a patch of bare earth somewhere flat and sunny which would be perfect for a solitary mining bee. Reducing pesticide usage will also remove stressors on any potential pollinators in your garden.
Being more observant when out in nature is another way to help pollinators. Try identify species of butterfly or bee when next outdoors, see how many species you can see in a minute!