My main strategy used (even from legit days!) has always to be building the shells like mains. This isn't necessarily hard. For the most part, make the shell LOOK like a main. Get at least one pet that's well-named. Numbers are allowed, but try and be a little creative? If possible, work on hidden avatars. Do clickable avatars at the very least. Use scoresending if you want a game avatar, though I wouldn't try for more than one (generally I can play legit for the Sutek's Tomb avvie.) Customize the pets, doesn't matter what kind of items you use as long as it's not dung or a rubbish sack. Run a shop as well. I shoot for a maximum capacity around 20. I'll keep it stocked with at least a few ETS items at a time and collect my till daily or weekly, depending on which shell it is.
Next step is activity. Make some Neofriends, though making friends with another one of your shells leaves you vulnerable to chain banning. Lately I've used my friend's account (he plays legit and I regularly gift him.... the legit makes the rest of mine look legit, like a circle of friends playing the game and we all gift each other.) There are other options, but this just happened to come up for me. Other activies.... play the featured game and pick a few favorites. Spend about half an hour doing games alone. More or less depending on your mood. I find a lot of games fun, but MAN I suck at them. Other things you can do are dailies. They only take a few minutes. Shop management also counts. Make a gallery. It can be anything. One of mine has faerie plushes. Another is jelly. Just jelly. All jelly. I'm very proud of it. My friend collects broken toys for some reason XD
All of the accounts are on separate proxies and most of my transfers are through Neofriend only auctions or trading post. I leave reserved in the comments OR if the shell in question has recently done a lot of AB'ing and doesn't have funds, I'll pay full price to transfer items over so that the shell gets points and I get my items. Other times I sell to other players as a method of replenishing. Most of my AB goes through stores like plushie, toy, and food. Each account prefers one shop, but none buy exclusively in one or another. Also, the items circulate between themselves and my main + my friend. There are five accounts total.
This takes up quite a bit of time, but if you have a schedule on Abrosia I think that it's reasonable to do these little maintenance things in the off periods. I do believe that there's a higher chance of being iced, but it's unlikely that TNT will think that this is one person with four accounts and another person with one. ESPECIALLY since this goes on on weekends and holidays, someone's almost always online. Occasionally I'll have two interacting in Firefox and Chrome. Anyone else do this?