The three methods I tend to bounce between are the basic number grid method, planetary grids, and just trying to use the shapes to make something pretty.
I usually, remove the vowels and repeat consonants and duplicate numbers, which would leave me with “HVLTNPRS” which is 84325791 if you use the accompanying numerology chart above.
For this, I used a short, clear focus phrase “LONG, HAPPY MARRIAGE” and used Jupiter’s grid to make the below sigil.
If you want to do a different method, add a shape that’s not accounted for in your focus phrase or just plain add wild emotional scribbles, follow what feels right.