Building up reputation

What's the best way to quickly build up a reputation and start gaining buyers' trust?

Recently got back into Pokemon and started ripping a bunch of packs. Looking to make some money back by selling singles, but not getting much traction due to not having many reviews.

BUY as well as sell. Buy the things you would normally maybe get elsewhere or local from ebay instead. Books, pens, appliances, tech, bed sheets, cooking, etc. That gives your account good user confidence.

@MootSam pretty much covered it but one thing i'd add... grade your sellable stuff before you even list. Nothing burns early feedback faster than calling a card NM when its got a soft corner you didnt notice. Buyers in this hobby are picky and one "not as described" early on hurts way more than later.

Also slabs if you pulled anything decent. PSA/CGC takes ages but a couple graded cards in your sold history makes you look way more legit than someone flipping raws out of fresh packs. Had a buddy who did this when he came back to the hobby, his account looked more trustworthy fast just from having a few slabs mixed in.

And honestly dont sleep on bulk lots while your grinding feedback. Sell the commons/energies in lots of 50-100, cheap stuff moves quick and every sale is still a review.