In a startup, there are only a few groups of people who matter: users, teammates, partners, and investors. “Advisor” is not one of them.
An advisor is someone you give equity to in exchange for advice. This may sound like a good idea. Founders do it to look more legitimate but it rarely helps. In 99% of cases, it’s just theatre.
This isn’t to say advice is worthless. Good advice is rare and valuable. The people worth listening to don’t want to be advisors. The ones who do usually aren’t worth listening to.
If you think someone’s advice is so good they should be an advisor, there’s a better solution: ask them to become a user, investor, or join the team. In later stage startups, these people may be good board members.
The best advice comes from listening to your users and your own conviction, not from someone else with a fancy title.