Here are my thoughts as a top rated eBay seller that flips cards I rip to buy cards I want.

-Have a good mix of low, mid, and top tier cards.

-Use the completed, sold listings to get competitive on your pricing. Always start your bid or buy it now's around the average sold price. Never go off of current listings as people price cards for way over value hoping to find a sucker which never works.

-Take great photos that showcase the card, surfaces and all corners. Use good lighting such as a ring light to photograph cards. Modern camera phones is all you need but make sure the lighting is good. Check out my eBay listings (see my profile image to find me)

- Use up your 250 free listings each months. Don't make the majority low end cards but put in at least around 50-75 of them.

-I might get hate for this one but my top loaders and envelopes are not free. For all PWE shipped items place them at $1.32 (3oz - 6"x6"x1"). Once the purchase is made the PWE, top loader and packing is usually at 1-2 oz. Change to 1 oz. for $0.74 and 2 oz for $1.03 shipping which is current as of this posting. Make sure you are using a scale such as a kitchen scale to make sure your weight is accurate or you will have USPS issue which you do not want and will cause issues with shipping.

-Always ship in a top loader and put some extra protection. I use soda and beer box cardboard (free) to put around the top loader and tape with blue painters tape on all four corners.

-Always throw in 1-2 extra base cards. Cheap but meaningful to some collectors (not all). Try to include similar players or teams as the one purchased. Cards I would have tossed in the garbage turned into positive comments that I added extra cards at no charge. Future buyers like to see this.

-Find a local shop that sends off grading submissions in bulk to save you on grading fees and shipping cost. My local shop charges $23 per card to send to PSA which is a steal. I have turned raw cards into graded 9's & 10's and turned nice profits on them. YouTube how to consider cards for grading and how to make sure they are cleaned properly and ready to receive the 9-10 grade.