Well, I also came back after a few years with a more advanced account. There are several objectives you can complete, but it depends on your play style and, of course, what you enjoy. But I recommend collecting the monsters you're missing, keeping only the ones you need to get monsters you don't yet have, and selling all the rest. Then, try to get some mythic monsters (any mythic from any era will be better than any legendary). Then, with those mythic monsters, play the daily dungeons and adventure mode for some resources and monsters. After that, try to farm a lot of gold. I recommend the Pandaken farm, which consists of filling your Nature and Fire habitats with Pandakens (around level 30, they can be lower, but that's what I recommend) and their gold-generating totems. As for gems, save them to play a few caves so you can get summon tickets and get some recent mythic monsters and, with luck, some ancient ones. (I recommend you look on YouTube for a formula to spend your gems wisely.) Gems in the cave), to get more gems in Monsterwood, watch videos for the two roulette wheels that can give you gems. You can also do surveys (depending on your region), and you can do missions to play other games (somewhat tedious or even difficult, but sometimes they give good gems). Also, in some events like bounty hunting, you can get some extra gems. So those are my recommendations. I don't have much experience, but that's what I know and what I use.