In my projects I see that many times the .git folder grows too much and you can reduce it if you require spaces or consider it excessive.
To reduce it by reorganizing all existing objects in a single package, more efficiently, you must execute:
git repack -a -d --depth=250 --window=250
A pack is a collection of objects, individually compressed, with delta compression applied, stored in a single file, with an associated index file.
Packs are used to reduce the load on mirror systems, backup engines, disk storage, etc.
Detailed information on the git repack command at the following URL:https://git-scm.com/docs/git-repack
I show you an example of a 25% reduction: