Let me help a bit.
If you want to be lvl 60 fast go and gather black ice. Unfortunately it’s broken and you take the hell of xp.
If you wish to gather huge amounts of materials in absolutely no time place at least 3 perks in expertise, you need the hardworking perk. But use a pickaxe, it unlocks on lvl 43 so you can fix one.
Lvl 44
Suggestion for perks.
20 points expertise (final beast of burden, you carry the whole damn map
)
15 points agility, you need the quik footed.
5 points in vitality (regenerate)
4 points in grit.
Use an agility weapon and pickaxe. Take some steel and leather with you to repair your pickaxe on the way and a good Thrall to tank your path.
Everything you lost in materials you’ll get back in max an hour and you’ll lvl up too just from harvesting.