35 sales in my first 30 days on ebay

Hi, i have just started selling on ebay , i have a good background about marketing online, and product facing, showing details and listing correctly online, i Started with a $500 budget and posted so far 140 items , 35 sold , my question is , is that a good start? And would it be able to be scaled to 100 items a month easly ? With mre inventory? I would love if someone answers me , and for the profit margin it’s about 40% net profit after everything, with an average sale per item $37 , average profit per item $17.6