Level 76-79: You can still do Draco commission quests if you want, but now you actually have a real chance of being able to enter Crespo Dungeon A parties which is the fastest possible training stoneage2 Gold and also most money consuming.

Level 80-84: Well now you've earned the right to enter Python Castle so you can either make use farming & leveling at the same time in it or keep going to the dungeon. There are places where you can train for best results such as the "Far East," "Far West," "Mid West," "Mid East," and "Inner Wall."

You really should get a party for this and not enter randomly (you should've realized this by now cause you've been playing long enough(Stoneage2 Gold) to realize its rude and can cause you to get poked and you having to pay for another teleport or long run back).

Level 85-89: Now you can go to Isle of Avalon, and this is mostly for soloing but also pretty good for it. I'm sorry that there isn't much info on this you can even "still" go to Dungeon A parties in Crespo for good experience too.

I hope this helped you! When I referred to the AoE parties, BobKelso999 has written a very nice guide concerning them.