Reduce the number of times you cut the grass
All pollinators need flowering plants to provide them with food. Early on in the spring the best source of food comes from the dandelions and other 'weeds' in your lawn. Reducing the frequency of cutting or choosing a section to leave long can help with the supply of wildflowers in your garden.
If you can leave the first cut until mid-April and then cut 6-weekly after that (end of May and mid - end July), this allows the dandelions to grow early and then for wildflowers to establish between cuts.
Or you could take part in 'No Mow May', a Plantlife campaign to let wildflowers bloom in our lawns.