The things that have synergy with your current pilots are Research, Hauling, PI and station trading.
I don’t do the industrialist thing really but it’s my understanding you normally do any research on your manufacturing character. So a 3rd account could do hauling/PI/trading.
Your current setup seems like you aren’t interested in PvP overmuch so ganker/Faction Warfare/nullslave are probably out.
If you are looking for something more active or a change of pace, possibly Wormhole anomaly hunter, Abyssal runner, or Incursion pilot.
Trader, you have to sell your wares (and also buy minerals and other things for your production). Trading is a very large part of your profit margin as a producer.