Hello clearweb,
Please find the code of the logo size mentioned on acmethemes/core.php file. In that file you will get the custom_logo size mentioned. Please change the height and width of the logo as your required size. After than, go to appearance > customize > site identity and add the logo again.(Upload New logo with high size). Hope, this will sort out your issues.
Note: Child Theme is recommended to customize theme.
Let us know, if you have any confusion.
Regards
Acme Supports