Roth IRA Thought?

Im quite confused here. I see max contribution for it is 5k for both 2024 and 2025, so max i can put this year will be 10k. Next year it will only be 5k. What the heck can you do with 5k a year? I mean my weekly drops will not go through so I will just have to be looking at the stocks and sell ( sell or underperforming ones ) to buy stable or new ones with the money i get from selling? Makes no sense, no clue how money can realistically grow exponentially with this capping issue. Thoughts?