You could try this also as well as Guyomar's good suggestions.
I see that I frequently and often use the word "very" which is extremely overused,
sometimes does not suggest overusing.
but I must rely on it,
but I have to rely on it,
but I need to rely on it,
but I always rely on it,
because I have a limited vocabulary at this stage of (my) learning.
I have no other choice because I know so few words/I have a limited vocabulary
I've already written the verb "to use" 3 times
I've already utilised the verb "to use" 3 times
I've already applied the verb "to use" 3 times
I've already used the verb "to use" 3 times
I've already made use of the verb "to use" 3 times
if you want to be fancy and flowery
I've already plied the verb "to use" 3 times
I've already abused the verb "to use" 3 times
I've already squandered the verb "to use" 3 times
I've already availed myself the verb "to use" 3 times
I've already made available the verb "to use" 3 times
I've already benefited from the use of the verb "to use" 3 times