Just wondering best way to minimize tax implications when having large gain! 

Say I buy 100k shares @ $1, SP goes to $10 & i sell at that price!

Then within a day or so, SP drops to 5 & I by back the 100k shares  at $5 or even double my holding to 200l.

Assuming the SP might go significantly higher than $10 after a few months or so, would it have been better to hold or use the sell & reuy at the lower SP strategy? How the tax amounts factors into this? 

Thank you tax expert!!