The first way is to feel appreciation for the Reiki right now. I offer thanks before, during and after a session. When I feel grateful for the Reiki energy I feel it grow stronger. It follows the law of attraction by giving attention to the Reiki it flows more noticably. Appreciation also raises your vibration which allows the Reiki to flow more through You.
The second way is to allow your heart to open and feel love for the person or animal or situation that You are Reikiing. Give it a try next time You are Reikiing someone. Just start thinking loving thoughts or bring attention to the love that pours from Your heart to theirs. If You are Reikiing Yourself, then think loving thoughts about Yourself.
A third technique that is especially helpful to Reiki I practitioners is to rub your hand on where you want the Reiki to flow more strongly. If you are working on someone’s arm for example, just gently rub Your hand over the spot. Then allow the Reiki to keep flowing. You will most likely feel more heat or tingling sensation in your hand.
A fourth way to increase the flow of Reiki is to get another attunement. Each attunement increases the flow of Reiki. You can even receive another attunement to the same level that You’re already attuned. Of course You will need to contact a Reiki Master Teacher for another attunement. I myself will re-attune people without having them take the entire class again.
Finally, receiving Reiki sessions will remove energy blocks and align Your energy so You can more fully channel the Reiki to others. You can trade with other Reiki practitioners or find a Reiki share to attend in Your area. If you live near me in Colorado, I have a Reiki share list to email notices of Reiki shares.
In any case, no matter how much you feel the Reiki flowing, trust that the Reiki is always working for the highest good of all involved.
Blessings!