How to estimate the valid condition for buy position just plotting two SMA indicators to the chart

When plotting two SMA indicators to the chart (SMA with the period of 100 and SMA with 200) so we can look at the price - about the location of the price cmpare with 100 SMA/200 SMA. If 100 SMA is located above 200 SMA and the price is above 200 SMA so it means that the price is located in the primary bullish area of the chart. But there is the ranging zone between 100 SMA and 200 SMA, so the valid condition for buy order in this case is the following: if the price breaks 100 SMA to above on close bar so we may consider to open buy trade. Recommendation: please confirm any possible buy position with some other indicators.