Another Way of Making Sigils
I see a lot of people share the sigil-making method of writing your intention, removing the vowels and repeated letters, and combining the letters into shapes. This might work for some people, but I've always had issues with it, for a lot of reasons.
First, I love vowels! My initials are all vowels, and I've always thought they have a lot of character that can go into magic. They also distinguish words a lot, especially in English. Think of pat, pet, peat, pit, pot, pout, and put. They all mean very different things, but are only distinguished by their vowels.
Second, don't be afraid to add non-letter elements to your sigils! If you want to make a sigil of protection, you can make a shield shape, and outward facing arrows work great for banishing. Sigils are a visual type of magic, and adding visual reminders about the meaning of a sigil reinforces them very well. Along with shapes, I also recommend adding other symbols that have meaning to you, such as astrological symbols, shapes, and even using color as a symbol.
For example, this sigil was designed by Nicola Scott for her amazing witchy comic Black Magick. It is worn as a tattoo by the main character, Rowan Black, and doesn't follow the normal way of making sigils. Instead, astrological symbols are used to make a statement about Rowan's character. The sigil contains contrasting symbols, such as the Sun ☉ / Moon ☾ and Mars ♂/ Venus ♀. If you look closely, there's also a hidden Mercury ☿, and the three moons represent the Triple Goddess revered in some witchcraft traditions. The use of so many powerful, yet contrasting symbols shows that Rowan is a powerful but balanced witch.
I recommend reading Laura Tempest Zakroff's Sigil Witchery for more information on this sigil making process. Here are some examples from her book:
