How to strengthen the weapon to 7 in the online version of Swordsman Love 2? Say something from experience

Usually, you take some level 50 equipment to strengthen it to 5 first, and then take three or four pieces that you want to strengthen to 7. For example, you can strengthen the clothes to 5 first, and then change the clothes. Use pants to strengthen to 5, then replace the pants, just like this, after strengthening everything to 5, finally get 50 equipment pads to strengthen to 5, and finally strengthen the good ones from 5 to 7 in one go. Of course, this will also happen in the end. Rely on luck