That would be enthusiasms, although the word is not used this way very often.
The plural form of the noun supporter is supporters.The plural possessive form is supporters'.Example: He was really encouraged by his supporters' enthusiasm.
The plural form for the noun enthusiasm is enthusiasms. The noun enthusiasm is a countable noun as a word for an activity or subject that you are interested in and excited about. Example: The problem with his enthusiasms is that they all cost money. The noun enthusiasm is an unountable noun as a word for the emotion of strong excitement and active interest. Example: The enthusiasm of the fans spurred the team into action.
Enthuse is the verb form of enthusiasm.
That is the correct spelling of "enthusiasm" (excited interest).
The plural form of the noun 'energy' is energies. The countable noun 'energy' is a word for enthusiasm and determination. The noun 'energy' is an uncountable (mass) noun as a word for a form of power such as electricity, heat, or light; a word for a supply of physical power that you have for doing things that need physical effort.
There is no word 'vims' in English. There is a noun 'vim', and uncountable noun with no plural form. The noun vim is a word for robust energy and enthusiasm.
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The plural form of "is" is "are."
The plural form of "I" is "we."
The plural form of "was" is "were."