There are others who could give better answers. I don't see much taper, from thick diameter trunk to slender trunk in the size I would want for a bonsai. So to thicken up the base, keep the lower branches. When in doubt, let it grow out. I would just pot it up to the next size up of nursery container and give it another year or two.
But, a better set of photos would help.
Set the tree on a table, chair or bench. Use a piece of cardboard or bed sheet or something to make for a single color backdrop. Light colored backdrop, is best for seeing branch structure.
Take the photos such that the lens of the camera is horizontal to the top rim of the pot. Stand far enough back that the whole tree is in the frame. Then take a close up of the trunk, level with the rim of the pot. One shot from all 4 sides would be helpful, or a short video of the pot being rotated 360 degrees.
Then wait for Bill's Bayou or
@rockm or
@Mellow Mullet or any of the other bald cypress aficionados that know more than me to respond. It may take 2 days, this is repotting season, some of these guys are busy