@Crystal130 I once made a chapstick holder with the second method @Duesenberg described. If you want to check it out, I used pattern #36660 and quadrupled it to have 64 strings. Due to the big amount of strings, it wasn't all too tricky to knot in the tube shape. Akawool on YouTube has a video titled "tubular friendship bracelet" that might be useful.
I think there might be 2 options, the first one a little easier to knot:
1. You could start how ever you want, with triangle endings or with a normal straight row start and then go over all the strings by knotting one Alpha row after you finished. Or with the same start as one would use for the mandala Stars (see tutorial Videos of pattern 70).
Knot the bracelet and when finished, sew the two edges together.
2. the second option would be same, except you use the left and right outermost strings and knot them together already from the beginning on. This might be a little more difficult since your bracelet would be in the circular shape already at the beginning and through the entire knotting process.