If in trading apply fast trading strategy,
What obstacles are constraints
and weaknesses?
Right now you do not need to buy fast since the market is currently low but it was the good time to invest a huge amount in order to earn more profit when the market goes back to normal.
If you determine this is a good time to invest in bulk, you need to buy fast. Because the bitcoin price on the market is likely to increase around $1000 or $2000 very quickly.