For Halacha sheilos, ask your rav. If you aren’t capable of paskening yourself you shouldn’t be looking for people to hang your hat on. Find someone to rely on consistently, and finished.
That being said, assuming those who don’t have a rav aren’t listening to this and getting one anytime soon, I will state my rav’s opinion.
It is 100 percent mutar to take a hot shower on yom tov, being that nowadays it is clearly shaveh l’chol nefesh, unlike the way it was in the times of the gemara and the mechaber. – ??”? ??? ???? ?”? ??”? ??’ ??. He also said that since it is mutar it is a mitzva, kibud yom tov.