A very significant aspect of third parties is this: They provide a playground for people that wish to make a hobby for themselves, and play make believe "Politics," whereby they can have importance as big fish in small ponds.
If that appeals to you, go ahead and knock yourselves out. But realize in advance the truth of the matter.
An interesting study, is the history of John Anderson, who opposed Reagan in 1980. He's still kicking at age 94, and has been all over the place politically.
Harry Browne, former LP candidate blamed America for 9/11/2001.