To be realistic? Bitcoin will definitely not do 5x in the near future. It will be long for us to see that because 5x means just about $350,000. If you’re looking to invest and get 5x, you should look at Altcoins. They are usually Altcoins that give even more than that, you just have to know which one. Most times it’s best to invest in multiple so you have profits from every possible angle.
Well, if you want to take a bigger risk then altcoins are the choice. In fact, people will choose meme coins to get more than 5x profits. It's just that, if you want an investment that has less risk than other altcoins, then Bitcoin is the choice. I understand that we are looking for big profits, and I myself also invest in altcoins. However, if we can have an investment of more than 0.5 bitcoin, I think there is no harm in holding it and creating a new portfolio with new capital. So, I might prefer to raise new capital to buy altcoins that I feel have great potential.
Talking of other altcoins that has lesser risk, I’m referring to the top altcoins. For example Ethereum, Solana, Binance smart chain coin, etc. Also, the only way you can say that you’d prefer to invest in other altcoins using some other money must be that you have extra money (which I don’t think is the same case as OP) because he said $2.1k is what he has.