Block 29 is there for nothing. Here I described this problem: https://fxdreema.com/demo/mt4-wrong-closing-rule
Blocks don't wait. Although there is a way to make them wait: https://fxdreema.com/demo/mt4-wait-crossovers But I don't believe that you need something like this now.
If you want 1 trade at a time, just use one single "No trade" above. So, if there is any trade (Buy or Sell), the block would not pass and no other trade will be created until the current one finally closes.
If you want to make buy-sell-buy-sell strategy.... it depends. I see that you probably got idea from this one: https://fxdreema.com/demo/mt4-buy-sell-buy-sell-opposite-conditions And in this one the result is really buy-sell-buy-sell, but the indicator itself makes that possible, it doesn't work with whatever you put in "Condition" blocks.