The reality here is that for a while Bitcoin started to sound like a broken record. Huge investor inflows into ETFs could drive up Bitcoin's price. Again, although the flow of ETF-investors has cooled somewhat, the momentum of capital in cryptocurrencies is considered to be increasing. But don't worry, we've seen this story before with Bitcoin. And experienced cryptocurrency investors know this has happened to Bitcoin before Again the price of Bitcoin is not going up, even if it plays an indirect role for ETFs, the main reason is that you have retail and top buyers investors like me who are not institutional investors, you will notice that retail investors are increasing their holdings in Bitcoin. As time goes by we can expect more institutional investors to start buying crypto.
You are contradicting yourself by using the word cryptocurrency instead of bitcoin even when you were referring to bitcoin. Bitcoin is unique and has survived for long compared to shitcoins and the reason is that bitcoin has great potential due to its decentralized nature. This is why investing in bitcoin is good because it serves as an hedge against inflation, you are your own bank and bitcoin gives your the opportunity to make profit from hodling your bitcoin investment for a long period of time because the price of bitcoin increases overtime.
Shitcoins are centralized and most dev created them to deceive investors that it can be like bitcoin, unknown to the investors that these shitcoins are pump and dump. This is why I see shitcoins as gambling and not investment. A newbie like you should only focus on bitcoin and don't think that all cryptocurrency has the same potential like bitcoin, because they will not last long. You said something about ETF, only bitcoin ETF is functioning because bitcoin has being recognized by the US that it has come to stay.
From you discretionary income, you should assign an amount that you can use to buy bitcoin regularly weekly or monthly that will not affect you so that you can continue buying for at least 4-10 years and above non stop to build and grow your portfolio. Emergency funds is also needed to prevent you from selling part of your bitcoin when it is not of your own will. I see that you are a newbie always visit this thread to learn more on how to go about with your bitcoin investment journey.