No matter what happens, Bitcoin is expected to rise, especially with the upcoming halving event. Just take a look at the current market and how Litecoin has been surging in recent days.
Litecoin just recovered its price about 2 months ago. No good price rise for Litecoin in the past two months if you zoom out the chart.
Although there is no news yet about Litecoin being accepted as an ETF, its surge is solely due to the halving event taking place next month. Therefore, it stands to reason that regardless of any regulations or whether Bitcoin will be accepted as an ETF, Bitcoin will definitely experience a surge as it targets the halving event next year.
You are talking about reversed logic. Bitcoin leads this market so if we have a first Spot ETF in cryptocurrency market, it will be Bitcoin Spot ETF. Altcoins will have to wait longer to have their turns with Altcoin Spot ETFs. By saying Litecoin first, you are talking it not logically.
So, my advice is to not lose hope in Bitcoin and to continue Dollar-Cost Averaging (DCA) by steadily investing in it.
With DCA, you invest in Bitcoin gradually, not steadily because you will add new capital for your investment gradually with time. Invest steadily means you do it with big capital very suddenly and maybe from your pocket or perhaps from a risky loan.