There is no doubt that many people will panic and sell off should the market start crashing if the Bitcoin ETF are rejected. This is normal but since we know that Bitcoin will always come out stronger, the wise thing to do is to buy more. To succeed in Bitcoin requires that we have confidence in it.
Prices are on the rise due to rumors of a spot Bitcoin ETF getting approved by the SEC. Not has been officially confirmed by the agency yet, but you know how it goes. If the SEC delays ETF applications again, you can expect the bullish season to come to a halt. At least, for a short period of time. Bitcoin has been known to obtain new ATHs in the past without an ETF. So it's likely BTC will do fine in the long run.
In case spot ETFs are approved by the SEC, market prices will never go below $26k ever again. There will be a massive bull run like you've never seen before. Your best bet would be to buy and "hodl" as much Bitcoin as possible before this happens. Who knows if you'll become the next Bitcoin millionaire in the future?