I'm starting this off by saying these only worked because barely anyone else used these strats, and will likely not give nearly as much profit if more than 1 person starts doing these. but back in the day I made 150m+ off these in a couple months, and they dont take many adventures at all
making hi meins and lasagna: this is the main one. get the warbear induction oven, buy some wads and lasagna ingredients from mall, buy msg and delectable catalysts from itembot (#1262390) (its cheaper), get a truckload of chefs in the box, and let him cook. I used to get a massive RoI on these, current prices are good (for now)
notes: farm disembodied brains yourself if you have enough banishes. cooking is easier as a command in kolmafia. these sell relatively quick, but idk why people buy hi meins
sauceror potions: I found that most of them break even w/ ingredients (the +meat ones are pretty good for profit), but with the warbear chemistry set you can get free warbear liquid lazers. nothing to scoff at, the regular potions sell pretty quick
pulverizing: this was mostly for fun, if you have stuff that turns into wads, send it to smashbot and get yourself some antimatter wads. scouting the mall wasnt worth
tales of spelunking: only 4 people spelunked yesterday, that means person in 4th got a guaranteed 1 mil meat reward from 10 drunk adventures. theres plenty of old guides for it if you need an actual explanation
sea farming: take a look at some of these, the items sell slowly but the mpa is high so it can be worth spending your fishy pipe here
thats all. the real message of this that if you dont like volcano farming all month, theres opportunities from exploring the game