Short selling in bull run can be dangerous, but still when I see a resistance zone I can't stop myself from short selling! what yours opinion in this case? Should I continue short selling in this bull run, or should prevent myself from doing this?
It depends because along the way, we will experience some short corrections as well and you can take advantage of those.
Of course, the risk is higher when you're trading against the trend, but I believe that there are still opportunities to it especially when you're doing futures trading.
As for your question "Should I continue short selling in this bull run, or should prevent myself from doing this?", it depends on the knowledge and experience that you have. For sure, most will say that you should avoid short selling when we are on a bull run because trading against the trend is very risky, but there are some expert traders out there that are still doing it because they believe they can, and they have a stop-loss just in case.
As for me, I will not say if you will avoid it, or you should continue. The only thing that I will say is that trading against the trend is dangerous.