This seems like a bad idea all around. BITI, like many “ETF that tracks ___”, tracks daily changes, which means as price chops around you’re continually losing value, i.e. BTC can break even over a year and BITI will lose value. Then there’s the issue of it tracking a deflationary instrument that is essentially guaranteed to rise over time unless it were completely eliminated, just due to people losing BTC via bad/lost hard drives.

Any particular signal for your trade?

I hope you're right but bubbles tend to go through an exponential blow-off phase before the crash which often takes out shorts who were right but too early.