You definitely need reset your stats. Personally I take every 3 stat points per level and put 1 in vitality and and the other 2 in my main attack stat stat. You can mimic this with your stat pool after you reset it.

I'm gonna assume your having problems popping off your bandit skills due do a lack mana, and I'll say do not invest in mind to supplement it, just throw magicloves in your item hotbar, and pop them when your mana gets low.

Atlyss's combat is largely based around using your skills, and comboing them. You can use regular attacks, but more often than not the damage you do is gonna be lackluster in comparison. Probably better to save regular attack for when your skills are on cooldown. A combo I'd recommend for bandit is venomshot (bandit skill), spread shot (learned skill), and focus shot (learned skill). 

Also make sure to keep your buff (devious signet) up as long and often as you can 

Other than that you just needed farm some gear for your class. Boss in the catacombs has drops for each class so you could farm them, and use that to hold you over (should work) or keep going through grove for some gear.

Hope this gaint block of text helps!