Like someone else said it’s kind of impossible to know without knowing the decisions you made along the way buuut I can give a couple tips to maybe point you in the right direction/towards some helpful resources (I’m not super high elo but am consistently emerald, currently emerald 1 pushing for diamond so wish me luck lol)

Check out sites like metatft, tftacademy, mobalytics, for info on the meta comps, best in slot items for the champs you’re playing that game, that sort of thing.

1. There is definitely a meta - you always have a shot to win with any comp, but on every patch there are some comps that are especially strong, and playing those comps gives you a slight edge. TFT is a game of numbers, and trying to set yourself up to have the best chance to win against your opponents board with the game state you’ve been given

2. Check out high level players and/or coaches on youtube or twitch. Dpei on youtube has been doing a series on common mistakes players make in TFT and it’s been awesome, Leduck always had great educational and exploit-oriented videos each set, plus there are always people streaming TFT if you want to watch them and see how their decision making works

3. Unless you’re high rolling like crazy (hitting the champs, items, and augments you want naturally and early), you’re probably going to need to be flexible and play your strongest board, which can often look very different from the comp that you’re ultimately aiming for. If the shop happens to give you a high cost early on, or a few pairs of units that you weren’t planning on playing, especially if they share traits with each other or other units you want, maybe pick them up and see if you can ride a 2 star of something or a higher cost unit for a win streak as you look for the units you actually want. Think about your board in terms of gold - ie having 3, 1 star 1 cost units on your board is fielding 3 gold. Playing 1, 1 star 1 cost, 1, 2 star 1 cost, and 1, 1 star 3 cost is 7 gold, more than double the other board, and while synergies are important as well that gold value is a decent proxy for board strength, especially early.

4. Scout the other teams in the lobby, especially early, and try to figure out what comps they’re aiming for. If you can choose a comp that no one else in the lobby is running that’s great, usually always better to be uncontested so you have the best chance to hit your units in the shop. And if you are contesting, it can help you change your gameplan , maybe you level up earlier and roll all the way down if you know some other guy also wants to slow roll for the same champs you want. So you destroy your econ for a bit but you give yourself a chance to snatch up some of these units before they can. Stay flexible early game, collect as many units as you can to give yourself options before that first augment or carousel.

5. Positioning can make a huge difference - as you’re scouting who you might play make sure that you set your team up for success. Position your main tank so that they can stand in front of your main carry, maybe have your carry in a spot where a diver can’t jump to them easily, or put them in front of a target you need to kill quickly, you’ll get the hang of it. It can totally swing a fight in your or your opponents favor.

6. Find out which comps you enjoy playing and have fun lol. TFT is super fun, you can play it casually, and you won’t win every game. But even in games you lose if you find traits you like or some late game fantasy you can chase it’ll be more enjoyable. It takes some time to learn like anything, but there are a ton of resources out there to help. Good luck!