Open your account ---> go to orders ---> order history you will find the price at the time you bought. go to spot and you will find the current price.
Also, I think you will find a detailed price trading when click on price (spot window) but I don’t know if there is a way to export it in the form of .cv file
Might be worth mentioning I'm only talking about the binance app that comes with the safepal wallet. I don't have an account on the binance website.
I do see something kind of similar that will sort of help, in order list -> order history, if you dont do a ton of trading you can scroll down and eventually find the coin you bought. As long as you bought it with USDT you can know how much it is in that since it only tells you the price you paid in some other coin. So if you bought it with Binance coin, you have to look at the date, go to a website that gives you the historical price of BNB, find the date it was when you traded it in and convert that to dollars to get the price in USD. Issue is I mostly use BNB to trade with since it has lower fees so just taking a screen shot and labeling the date/time/price then n all that seems the most easy way to do it since I don't see any total gain/loss or price in USD I bought it for on the app itself. I've been trying to just keep a mental list in my head, pretty tedious.