There have been bull run without Bitcoin ETF and there will always be bull run even if the ETF is rejected. So even when the market temporarily nosedives if the ETF is rejected, do not panic. Once again, hold on to your Bitcoin and do not panic.
The successful of Bitcoin ETF simply means more institutional investors will be attracted to the market as that's how they enter into a market through EFT. Not everyone's wants to go throw the process of buying Bitcoin before they can Invest into Bitcoin and Bitcoin ETF solves that problem so while ETF is getting rejected or approved, none of that should concern you because the success of Bitcoin isn't tied to the success of Bitcoin ETF. Bitcoin will keep surviving with or without them.
The increase in the price of Bitcoin should give us an idea what we're to expect when the bull market starts officially after Bitcoin halving. There won't be time to try to catch the market as everything will happens very quick so buying while the price is still at this low is the best steps to take so you don't be among those rejecting not investing into Bitcoin while the price was low. While you Invest also remember to store your Bitcoin securely in an open source hardware wallet or non custodial wallets like electrum but on an airgapped device.
As an investor you don't have to be concerned about how the market is moving as you'll be playing the long term game and profit when the price of Bitcoin is at a new ATH. Ignore the negative news surrounding the market and keep on Hodling
These are some great points here. Bitcoin doesn't necessarily need ETF approval; it'll survive without it. Yes, it'll certainly boost its price if it is approved (and probably its anticipation has already caused a spike in price); there's no doubt about that, because, as you said, it'll open up more platforms and will be available to major investment brokers. However, if it's rejected, it won't be the end of the world. Bitcoin was doing just fine all these years without it; it'll be okay. Certainly, these unpleasant news will have a negative effect on the market and probably cause a crash, but ultimately, it'll recover, as the halving cycle is coming soon enough.
If you're aiming for short-term profit, it's normal to worry whether Bitcoin becomes ETF approved or not, but if you're looking long-term, over two, three years, or maybe more, it shouldn't affect you much.