Best way to farm XP?

At level 59 rn and need level 60 for the 5* that comes with it (I bought that $5 deal a while back) and figured this is the perfect time to knock it out while I have this 20% XP boost. So what is the most efficient way to farm XP? Any help would be appreciated.
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That boost and the 7 day boost will stack
Explore Act 4
Back in the days... When deepwounds where not invented, Assassin not avalible... Mastery Setups where more easy then i guess...
Enter, scout out the map or revives/full energy refills (usually spawns a few tiles above the boss node). If there’s nothing, take the short path to the venom boss, kill him to reset the map. If you find something worth picking up, take one of the long paths to venom, collect the item, kill boss to reset.
With a bit of luck picking up refills you can run the map multiple times in one go, using the refills you just collected as you run out of energy. Happy farming.