hello experts, i have created an application where i need to do the lookup value from static excel, it has more than 25k records and it will grow further in future. i used the below function to lookup the value but it works only upto 15000 records exactly. how to make it work with large data?

ClientList -> excel table (static excel)
Engagement number is the column in excel table
DataCardValue6 is the reference field
'Eng Manager Name' is the result i need to get from excel table.
The above function is working fine exactly till 15000 records, but it didnt pick the result post 15000.