It is necessary to have an improved weapon to make it stronger and thus achieve that it can level up, because the higher the weapon level can be in Genshin Impact, the more EXP the weapon will offer us, to make the respective improvement it is necessary:
Go to the characters menu
Then proceed to select Weapons.
Then check that the upgrade is equipped, for which it is necessary to press Switch on the right side of the Switch in the bottom corner on the right side of our screen.
Then click on Exchange which will take us to a new window with some Details, Improvements and Refine, only it is necessary to choose Improvements.
Once we click on Improvements we will have the necessary information about the weapon, and here it is possible to press some signs.
Then a window will appear on the left side, where we can incorporate materials to make the weapon stronger.
We have the possibility of incorporating 6 materials in the six respective boxes, for which it is necessary to select the materials by adding an Improvement Mineral.
We can observe the level of our weapons in the upper part of our screen on the right side, in such a way that a number will appear on the level indicator which indicates the EXP, since this allows us to level up the weapon in such a way That this can be yellow, however when using a sword of level 1 and give it 400 EXP it is possible that it rises to level 2 thus obtaining 2.
If we do not want to go through this process, it is necessary to locate the material boxes and click on the Auto-add button, as this will be done automatically, it is necessary to make use of the drop-down menu on the right side requiring 1-star materials for our use and change it in the drop-down menu by selecting 2 or 3 star materials.
This is all you need to know about how to Enhance weapons, it is simply necessary in Genshin Impact, give it a try.