@thein999 Glad that worked for you. If you have live data coming in every minute you can look at using dcc.Interval to trigger a callback to save the new data in dcc.Store and then have your display_chart_v function read the data from the dcc.Store.
You can also look into @Emil solution for updating traces on a graph without generating a new graph object here and on StackOverflow.
Also, great job on your dashboard! Impressive for only using python and plotly for six months.