In low light on a phone camera with little in the way of user-adjustment, your primary objective is to keep the camera still.
Find a wall you can rest it on, & if possible use a delay timer, so you're not actually holding the phone as the picture is taken.
If there is nothing suitable to rest the phone on find a wall/fence/tree to lean against.
Keep your arms tight to your body & the phone tight to your face.
Hold your breath as you take the picture.