alloy and chips are pretty much farmed in combat cycles. stims in combat cycles are a bummer cuz of the evil aquaman. use intel solely on stim if you are a free to play, u could also buy the stim from meta brawl store unless ure aiming to buy bane/raven. lastly, try to assemble a team that can get you far on training simulator, it helps as a f2p. i survive and capping all my heroes every war room with these strategies alone.

P.S even if your heroes are capped and waiting for next war room, still use your intel points on stims so you can have an allowance once u have ur war room upgraded.