I've sold tons on Vinted. Last year my target was 50 items a month. This year is 30 items a month (busy year personally) and I've hit it consistently so far. I'm in with joining in here, but also happy to give a few tips.
try to list 2-3 items a day, over the course of an hour, every day, rather than 15 things at once. If you want to do all the work at once, save them as drafts and publish them sporadically. This bumps you up Vinteds algorithm.
List similar items at the same time, and write in the listing to check out your wardrobe for more similar items.
If people favourite 2-3 items, message and tell them you'll offer X as a bundle price.
WITHDRAW YOUR MONEY STRAIGHT AWAY FROM VINTED!
Price higher than you think, unless you literally need the item out that day. People don't value cheap, they think there's a reason for it. Send offers out with 10% off instead.
Don't stress when people inevitably comment on here and say 'what about the tax?'. You aren't buying to resell or selling for profit. You don't need to pay tax on this.
Size wise, I personally find it better to add 'fits like size xx' in the title, then in the comments say size label says xx, I found it fits more like xx, please ask for measurements. Put a picture of the size label.
@lindyloo57 you aren't pricing the boots too high. For £90 I would be writing the RRP and worn twice in the title, listing for £50, and sending out offers for £45 to those who favourite them. Gabor is a brand that sells eventually, for a good price, but not instant. Write key words in the listing- autumn, transitional, suede, comfy, padded, etc.