To restore the Fishing Shrine in Taro’s Love – Restore the Ancient Shrines to open the Guardian Tree in Kena: Bridge of Spirits use the pulse ability next to the Fishing Shrine and observe the order the candles on the shrine flash. This is the order that you need to shoot at the 4 pillars with the blue stones that are positioned around the shrine.
For me, the order was the front right, followed by the back left, then the back right and finally the front left. You will know you are hitting the right pillar because they will flash brightly.
After the corrupted flower opens up, use the Rot on it and then shoot it with your bow.