I think ‘bolstering’ needs to be replaced with ‘rising’ or ‘increasing’, because ‘bolster’ is often used to mean’strengthen’or’manage’. If I ever had a chance to meet him, how would he help improve my self confidence? To expand “to expand’ means to expand in size. Where you need to find a word which should be ‘increase’. To expand, replace with “increase number of” The letter to provide a number will mean the

number to increase in frequency.