It isn't clear what the intent of the game is. I think you try and complete it in as few moves as possible. Hence, the need for a counter and a leader board.

There are 6 lootbox [container] levels; Trash Can, Cardboard Box, Crate, Rocket Ship, Animoo and Treasure Chest. These graduate in value by multiples of 10. [Trash Can = 10, Cardboard Box = 100, Crate = 1000 etc.]

These yield point values of 2, 3, 5, 10 & 20 in multiples of 10 at each level. So, points received for the Crate level would be 200, 300, 500, 1000 & 2000. Points are split into two categories; Hats and Skins. Collecting these receives achievements. Equipping an item only changes the appearance of the current lootbox. It doesn't improve your chances. [It's also my understanding you can't unequip an item.]

It's very much like a slot machine in mechanics. There are 4 positions for loot from a lootbox. At the starting level, it cost 10 points to open a lootbox [Trash Can]. The house stakes you with 30 to start.

Click Open the Lootbox and 4 coins will explode from it and land in the available positions. Their type, whether Hat or Skin is revealed as is it's value. Within the Collection, items are broken up into categories based on availability. There are Common, Uncommon, Rare, Epic, Legendary & Holiday. Point values previously mentioned correspond to these categories, [See Item Rarity Guide for more info.]

Until you have collected a particular piece, you will have a choice of Keep or Sell. Keeping places the item into a slot in your Collection. Any time it appears in a lootbox after that, it will only have the Sell option available. Like a slot machine, many times the payout will be slightly less than the investment. But, the odds work toward an ever increasing point balance.

Now, hopefully, you understand the basic play. Here's my recommendation. Play each level until you reach 2X the cost of the next lootbox type. Then buy 1 at that level, keeping everything you can. If your point balance drops below 2X, drop down to the next lootbox level and build it back up.

Example: Level 1: Trash Can [10] build your point value to 200+, move up to Cardboard Box [100] and buy 1. Initially, you will usually keep everything, which will mean returning to the previous level and rebuilding your points. As your collection grows, you'll be able to sell more and stay on the higher level.
At the first level, you can't keep everything. Always keep high point items and sell those that are lower in rank and easier to get, later. There's a mini-game that lets you earn points, if you need some.

That should get you going. You'll prolly develop a more efficient method after awhile.