just go to lower floors so you don’t die so much, and high enough that you feel like you are getting good stuff. when I was Ascending for Perks, I just farmed for experience on floor 110 M3 95% of the time. by the time I got the last Perk, I had a lot of loot to work with to make my next build.
I haven’t really Crafted a Farm Build I really like, so every so often I make a new one. my better ones do well on M3 Floor 500ish, and my current one is mostly an Epic Affix Farm Build for Very Easy floor 200ish.
an Easy Farm Build by definition will only do well on lower floors of any difficulty level that they are able to handle. and they are only used to make A Better Farm Build, which is used to make A Great Farm Build. A Great Farm Build only needs to do well on floor 500ish of the difficulty level of your choice. Farm Builds for floors over 500 are just to see how well you can Craft a Farm Build or get items that can only be found on floors up to 1000 on M3.
eventually you get to a point that Armor, Resist, Damage Resistance, HP, & MP for Manashield users, become less reliable and you need to switch to Dodge, Block, Sanctuary, or some combination of the 3 that keeps you from dying all the time. or make a Build that can kill monsters before they have a chance to attack you.