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There is no single piece of advice on breast stimulation and techniques for this process that works for ALL without exception. We are all different!
But there are some good techniques you can try:
Nipple between your fingers
Cover the breast with your hand so that the nipple is between your middle and index finger. Squeeze your fingers so that when you lift your hand, the nipple will also lift and pull the whole breast up with it.
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Lubricate the breast and hand with massage oil.
Place a palm on the breast so that the fingertips are positioned around the circumference of the breast. Lift your hand and at the same time caress breast with your fingertips until they close on the tip of the nipple.