Absolutely nothing, you can't do anything to make prayers work. Praying is some strange psychological thing where people talk to themselves, hoping that their messages will be answered and their wishes will come true. It's honestly astounding how people in 2018 still believe praying will miraculously do something good.
Unfortunately, praying doesn't work and that's been shown countless times. How many prayers are sent out to the families of the deceased after terrorist attacks, school shootings or fatal accidents occur? How many prayers are said, hoping that these things don't happen again, even though they still do? How many prayers does it take until your God listens and takes action?
If praying really worked, I'd be praying every day to stop each awful thing that the God you're praying to is allowing. The same God which allows terminal cancer in children, homelessness, poverty, rape, murder, war... The list goes on. It's quite ignorant that you pray to this God, which time and time again proves to be more demonic than the hell you religious folk fear yourselves - if I had to go to heaven, to stand in front of this God on my judgement day, I'd ask him to send me to hell.