Package not working on older version of R

hello All ,
I am working on the R package which I just pushed it to Git hub , the URL is

I have two questions

  1. when trying to install it is loading lot of packages ( that I am not sure needed ) , If I need to speed up loading process what should I do ?

  2. when trying to install this package on older versions of R ( 3.5 and below ) they are getting an error in installation . Where should I do to to make my package compatible with older versions of R .

Thanks a lot for your time and help.

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