Python code not working as desired

I have set EMA cross over to buy and exit.

It is buying but trading for 1 unit only.

I want it to trade total unit bought.

I am attaching the code and trade details.

If anyone can correct it?

Code:

For e.g. at start it buys 4 unit and then trades only on 1 unit.

I want it to trade on the total units it buys in the start and keeps on trading on that number of units.

Any suggestion is welcome.