I haven't used reddit in months, but i do the same thing where I delete accounts periodically. Last I observed, new accounts start out shadowbanned. Some subs tell you they won't let you post with an account that's too new or has too little karma. Others just hide your posts silently (shadowbanning, of course.... not necessarily site wide though). One thing I found that helps is to make new accounts periodically then don't use them for 3-4 months.