Assuming you can farm gold quite easily and you got an exp farming build like the one griffin built, heres easy way to level up from 1-50 then rest of levels, from my experience and I'd like to share to make many lives easier.
Note: Exp Farming will still be very Grinding and tedious.
Once you ascended , you become level 1, stats reset as well as your gear unequipped to the inventory and replaced with level 1 gear.
Dont worry, you can't ascend with full inventory and you need at least 8 inventory space for ascension.
After that, place zircons and then place 6 quest stones onto that freebie level 1 gears given to you (Dont ever dispose if u don't want to repeat zircon and quest stone).
Once you got that covered, make the ascended character hirling or have hirling and you be main character.
For a certain period of time, levelling will be easy buf you won't shoot from 1-50 instantly on all ascensions.
After you feel like it took so long and your hardly making much progress or you want to be quicker, use gears that you collected, provided you collected them beforehand and put zircon with quest mythstone onto the socket.
This means wearing a druidic wildhide robe with ignore resist to save crystals as well as wearing some other gears to help level up faster.
The gears can be up to level40-80 but I recommend level40 because 1-20 is pretty easy, even at eternal ascension (since I got there in the first place).
That druidic robe wildhide (with ignore resist)and other gears level40+ should have 6 sockets filled with quest mythstone. Alternatively you can try finding rozenzi ring with ignore resist and do that same step of zircon on level40+ gear and quest mythstone on it.
The ignore resist is key on that wildhide robe or rozenzi ring for levelling up at single player to level up quicker since levelling up with hirling is slow compared to levelling in single player.
After you completed that step, use those level40 gears (wearable once reaching level 20) on single player on any floor above 100 that you found easiest then grind there without hirling and you will find that levelling will be very easy.
This is no hack or exploit or even abuse, this is just a method that I discovered.
Obviously after you reached level50 (quickly or slowly) you can re-equip exp gears that you either made yourself or inspired by griffins exp guide.
This is an easy way to get to level1-50 for any ascension.
After level50+ though, its gonna be a massive grind for certain ascensions so you will need to dedicate much effort and some time for this and you will make it!
Just wanted to add these extra tips to make someones life easier when ascending.
This is the least crystal way I can think of. Obviously there will need to be some stack of zircons and some other crystals for griffins build as well as the zircons for thr freebie gears given from ascending and the level40+ gears.
Of course you can look for gears with empty sockets level40+ and for the wildhide/rozenzi , you just add the socket and place quest mythstone to get 200% max exp gain.
Another tip is to level from level50 -100 is have a seven deadly sins gear with 6 quest stones and the seven deadly sins gear has some dps affixes to help with the exp farming. You can get up to 271% exp gain on the seven deadly sins gear but I don't know if it goes over the cap so just try griffins blightedswamp exp build after reaching level50+ .
I hope these tips to level up really save a life and make dq easier