Card show autograph advice

[Celtics18]

I collect signed rookie autos. The best way to maximize non licensed autographs as an investment, is to have them sign on a players main rookie card. Now most players signed rookie cards sell for the cost of the rookie card + signing + grading cost, so very little room for profit in short term. In the long term, I think signed rookies are extremely under appreciated with more and more sticker autos. Hard to beat a card that was held by the player and signed by them on card. Otherwise, I'd go with what others said, any personal items or a signed baseball is cool. Hope that helps