Going to upgrade your Q to things to do before true reincarnating lol.
1 - Hunt gear for your next life. Since you can run heroic stuff at epic, you can zoom through and nab any important gear.
2 - Get any favor-unlocks that persist through TR. Universal enhancement trees, fvs, a +2 tome, etc. If you're close you might want to push a bit to get them before tr-ing, since that resets favor.
3 - Figure out a plan for reincarnating. I suggest going for class completionist first (1 of each class) because it's frontloaded. You get the big reward, completionist, faster than other reincarnation finales. Racial completionist is very powerful, but doing 3 of each race takes a loooong time. You can also mix in an epic life each time really, going 30+->20->1 like you're going to do.
4 - Maybe get some reaper XP. It's much faster at legendary levels, and if you don't mind rando groups, should be able to get a good chunk once you can survive in there (or join a loot-hunting party and they only care if you pass the loot!). Don't have to go crazy or anything but even running ~10 quests each life on legendary R can add up fast.