I want to know if it's worth to sell those small profits ($30*) to wait a down Bitcoin % to repurchase them again. Or is it very little profit and not worth reinvesting?
It depends on you if you want to take profit already. Remember a small profit is still a profit. $30k usd is not easy to earn. If that profit is still small for you and you can earn it in a week not from trading then don't sell and set your target price where you are contented with the profit you'll get.