diff --git a/src/strategy_team/strategy_004.rs b/src/strategy_team/strategy_004.rs
index a0fcefd..1242b8f 100644
--- a/src/strategy_team/strategy_004.rs
+++ b/src/strategy_team/strategy_004.rs
@@ -70,13 +70,13 @@ pub async fn list_up_for_buy(
     }
     try_join_all(task_vec).await?;
 
-    // 2nd filtering: BollingerBand (len:20, multiplier 3) previous_30m_price (close or low price) < lower_band
+    // 2nd filtering: BollingerBand (len:30, multiplier 3) previous_30m_price (close or low price) < lower_band
     let filtered_data_1st = filtered_data_1st_arc.lock().await.clone();
     let mut filtered_data_2nd: Vec<FilteredData> = Vec::new();
     let mut filtered_data_2nd_arc: Arc<Mutex<Vec<FilteredData>>> =
         Arc::new(Mutex::new(filtered_data_2nd));
     let mut task_vec = Vec::new();
-    let bollingerbands = bollingerband(10, 2.5, &alldata.rt_price_30m_vec, &filtered_data_1st).await?;
+    let bollingerbands = bollingerband(30, 3.0, &alldata.rt_price_30m_vec, &filtered_data_1st).await?;
     for element in filtered_data_1st {
         let mut rt_30m_vec: Vec<RealtimePriceData> = Vec::new();
         let mut bb_vec: Vec<BollingerBandData> = Vec::new();
@@ -140,7 +140,7 @@ pub async fn list_up_for_buy(
                 .iter()
                 .position(|x| *x.0 == element.symbol);
             let supertrend_option_30m =
-                supertrend(&element.symbol, &rt_price_30m_vec_c, 20, 2.0, true).await;
+                supertrend(&element.symbol, &rt_price_30m_vec_c, 10, 2.0, true).await;
 
             if rt_30m_option.is_some() && supertrend_option_30m.is_some() {
                 rt_30m_vec = rt_price_30m_vec_c[rt_30m_option.unwrap()].1.clone();