Here are a few different resources:
They’re all loosely similar and contain the same info. Understand what they’re trying to explain and you’ll be able to better evaluate your decks.
Money alone is a bad measure because it misses what the money is spent on. I have a precon that’s 3 or 4x base cost because I have some expensive basic lands in the deck. I could spend a ton of money and put a bunch of cash expensive Eldrazi in a deck but still get stomped before I can build a decent board state because everything is so mana expensive. It’s where the money goes that matters.
Additionally, you should really consider whether or not a 1v1 is a fair test of your deck. I have some solid upgraded precons that work really well in a pod and shit the bed in a duel. Precons are often geared toward at least 3 player play so if you’re improving the deck, you might be leaning into that. Some decks I play against do much better in duels than pod play. Some are great in both. And sometimes you just don’t have the heart of the cards no matter your deck.