It would have been better if people are taking advantage of market movement before investing in crypto, there is always times for sellings and there is always time for buying as well, for example early 2019 bitcoin was trading at 3,500$ and that was when i bought some, if people know how to take advantage of bear market and bull market it will be a different story for many
Things are always easier to say with hindsight. I too invested some when btc was at the 3-4K range, but now I wonder why I didn't invest more. Answer is easy ... nobody knows where the tops and bottoms are. We easily could be sitting here with btc at 1-2K, crying that we bought btc at 3.5K.
For the OP, he could look at some dexes, maybe some trade his coin. But if no exchange, anywhere, trades his coin, he's kind of stuck.