Sigils are able to be charged by other people’s awareness of them whether they do this consciously, or subconsciously. Through this understanding you would be able to strengthen the power of your magick through allowing people to interact with your sigils in order for them to give your working power. All you would need to do in order to do this is simply post your sigils in a public forum, so that when individuals interact with those sigils they will give them power.
This process can be more effective if you are able to find a way to make the individual enter an altered state of consciousness when they are perceiving your sigil. You would be able to do this through such things as making a flashing GIF of your sigils, or by placing an optical illusion upon, or behind your sigils. This will attract individuals eyes to it allowing their focus to be locked on the sigil whenever it appears in their View.Some practitioners have even used things like glitter bombs with the sigil inside in order to produce this effect, and practices such as these were also greatly utilized by the DKMU during their war on reality.
This is also able to be done with audio sigils, and because of this you would be able to implant these inside songs, or simply play these out to the larger public. You would also be able to say specific sigil words two other individuals in order to allow their consciousness, or subconsciousness to focus upon it.
Any sigil would be able to be used this way but would most likely be activated in a passive manner, rather than an active one. This is so that when the sigil is seen by the individual it will start to manifest what power it has gotten from that individual. Usually sigils that focus on this form of charging method will also be used to manifest your desire upon the individual who sees it because they will be connected to the sigil through their site, and will also be in the same vicinity as the representation giving the sigil a direct link to manifest upon them.