Depth of Field varies with the f number you chose. The larger the f number (ie aperture) is the more the depth of field (ie f22 gives more than f4). However increasing the f number will mean using a slower shutter speed.
Depth of Field is also greater the shorter the focal length of the lens. So at 70mm you will get more depth of field than at 200mm.
They are both laws of Physics and cannot be altered. So if you want more depth of field you need to increase the f number and use a slower shuter speed. This of course is difficult as the focal length increases, so use a tripod as well.
Generally I use the rule of thunmb that I can hand hold the camera when the shutter speed is no lower than 1/n where n is the focal length. So I can handhold a 70mm focal length at 1/70 sec speed but would need to have 1/200 sec for a 200mm lens.