when i hit around lvl30 with my sorc 2 days ago, i wanted a way to lvl up more quickly. i just played endless on the first map. as long as you know which traps to build you can easily hit wave 25-35 and get tons of exp. you will get 20+ lvls every single run. after 3 runs i was lvl100.

to start of you are best off having your basic attack maxed out. this takes care of highhp enemies early on, when you wanna get the money in.
make sure to spam essence traps all over the place and upgrade the one in the middle for the chance to get x3 essence (its important to have not only essence collector upgraded, but essence trap network as well). first 2 upgrades for essence
as for your dmg dealers, you use olympus and razor. all 3 upgrades on both of them.
for your utility trap you got the portal glyph. you take the first 2 upgrades on that one, with enough points you take the third. it happens so often, that enemies get teleported back, run to the trap just to get teleported back again and every time they loose 30% hp. its the perfect trap for endless, since its % based dmg
last but not least monster cage. since the cage is between the middle and left lane basically, i tend to upgrade my razors on the right lane first, since the other 2 lanes are taken care of by me + wolfs and 1-2 olympus in the middle.


in the end your goal is to get all essence traps out as fast as possible, while getting the essence upgrade on the middle one. essence trap network gives a big boost for each one, if you didnt spec that passive, spamming essence traps makes no sense.
you want a monster cage asap with maxed out hp and numbers. usually you dont have the dmg upgrade anyway, cause they are tanksummons and dmg isnt their forte. they are good to delay and clump enemies so your olympus can deal massive aoe dmg.
dont forget that portal glyphs can also lower lightning vulnerability by 45% and for me as sorc i get another 15%.

dont worry, just reset skillpoints and trappoints and get an endless farmspec till you hit 100. if you need gold, just do map 12 on hardmode. with the +50% gold i got over 50k gold in a single run. since you get 3 silver keys there, you get tons of money. even on casual that map gives you like 20k gold and casual should be a joke for everyone.

right now i did everything up to T4 map 5 3 stars and even the T4 maps arent a big challenge. archers + portal glyphs are just crazy. if you pair that with insane early game money from essence traps, the best boss killer tower with razor blade and your frost pillar, the maps feel pretty much like a joke atm. maybe it gets harder other then that the only way is high scores in endless mode, to test how far i can push.

it feels like the hardest part is pushing that "next wave" button every now and then.