100k is not hard too do fast, run temple HM or something.
Or just read on the forums like everyone said for builds that you can use and locations you can farm, if you invest a good 2 hours, rather than waiting for someone to tell you what to do, you can make 2-3x 100k.
running temple is popular right now and easy as you can do it with a hero, with a rit,ele, or a monk + a monk hero, and even with the major price drop it's still profitable, you can make 18k just off the people you're running, you make at least 5k off the merch junk at the end, and if you're lucky w/ chests, hidden chests, boss chest, and drops, you can make anywhere from 20-80k extra from chalices, relics, carvings, onyx, sapphires, rubies, lockpicks, greens, and golds that drop.
you can power merch if you have a decent amount of plat to start off w/, there's tons of ways to make money quickly. you just have to actually invest time.