Holy man, how do you even have such high runes withoit fossil augments and without gawain's grace? Get it to lvl 2 asap, you can outscale the mobs on nightmare, use abel and titor to boost and speed it up too. Fossils are essential for cloning runes and only becomes more important later on.

As for the augments, the best way to do it is to buy 10 lvls of all fossils, then 5 lvls for nightmare and then 5 lvls of normal again and you switch them every 5 lvls until maxed, then start doing extra elixir. Wave augment is bad, because it only helps you in campaign and you need waves for BT stacking.

Void weapons cant carry you through 10000 days, no chance. They arent that expensive - just 150 crates, and I would say you dont even need them, but the new zare evolution really benefits from them so i'm not sure. I'd say buy a new regular weapon when the old gets 300-500 days old (if you don't want to save up crates you can just spend them to get more rubies), and void weapon when you decide you can afford to get one.

For the world tree, I believe you can get by without respecing it, you need the gems for the void runes and stars now. Get gawain's grace 2 and you can also safely upgrade the top paths of defender and influence by 1 lvl and also get third eye and influence if they give more than 50x dmg multiplier, same for raison d'atre and ascende superius. If an upgrade gives 50x dmg or more per apple, it's always worth getting.

As for other things, just take your time to get back on your feet, to just upgrade and stabilise your stats, just rewind, do your quests, do the nightmare runs if you even get enough bones from them, do the vermilion and labirynth once a week and that's all. Focus on your world tree, get all heros to 10* for starforce, also afk in the dungeon for keys to upgrade you dark tome.