Tashas more or less put skills, tools, languages, and weapons.Given how the rest of skills work, there probably only should be only one; or at most two. 5 skills with niche uses makes for pretty weak knowledge skills (and there is the common problem of vague DCs that don't specify for the DM what sorts of things a knowledge check may reveal). Better than 3e, but not great. Most especially since if the group needs information for plot reasons they'll get it that information one way or the other. The knowledge skills are rarely as useful as the more active skills - in fact, I'd say everyone should get a knowledege skills for free from their backgrounds, and knoweldge skills should be considered as weaker than active skills - like tool proficiencies are.
Also, like tool proficiencies and languages, a character could practice to learn more of them in downtime.
Knowledge skills could be downgraded to a proficiency of the same level as tools. Tools, vehicle, instruments, and knowledges should be the same level.