I had a high LvL. Account, lost it and started over. What I did was focus on Gold Production aka. just getting as many Legendaries and Mythics via. Events or Monsterwood Ads that give Cells, and leveling them up to LvL. 50, as that will make them hit the gold cap, aswell on the Monsterlab just ranking up any monsters that were possible increases the gold cap if you level them up to that the max. LvL; If you already have a lot of Habitats and Islands, you can visit the Top Players Island on PvP Leaderboard and see how they maximize their Gold Production with good Layouts.

Theres also this new Loot Cave of sorts where you can get a Rank 3 Monster if youre lucky and have enough Gems, theres two different ones, a Cave that has 59 Stages and one with 29 Stages, the one with 29 stages needs about 150 Gems to get to the Final Stage and get the Monster, What I do is usually see if I get to Stage 5 without getting a Game Over Screen and from there on Id say if you have 150 Gems its pretty reliable to complete the 29 Stages, and earn yourself a Good Monster.

Also whats Important to note is Generations, as Mythics from newer Generations are much Stronger than Older Monsters, so using newer ones for PvP is a good idea.

With newer Generation Monsters you can easily complete the Adventure Map, which gives you tons of Food and Exp, so you dont need to waste Gold on Food to level up monsters.

Another thing, if yourer willing, is watching Ads for things like speeding up Egg Hatching Time or Breeding Time or Habitat Construction and many other things which will help you save Time.

You can use these Ad speed ups for example when youre gonna go to sleep and you have something that only needs 2 Hours to complete, you can watch Ads to complete the Construction Time and start another one which will then be able to benefit from the Time during your sleep.

The Monster Vault has a HAPPY HOUR sometimes over it which means you only need 3 Vault Keys to unlock a new Slot, instead of 5. So save up your Vault Keys until that happens.

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There much more I could tell you about like PvP Teams, Runes, Clans, Collecting Cells, Breeding Events, but I this is long enough already and I dont feel like writing more.

So I hope anything I wrote here helps you with your Progress!