I wish I'd known these time-saving tweaks and tricks from the start.

Is there a way to make all modifications I have made to my .bashrc file (new aliases, functions and scripts) without having to exit the current shell that I am in and starting a new one (currently ...

If you don't love the shell you're using on your Linux system, change it! There are plenty, including bash, fish, ksh, tcsh, zsh. There are quite a few shells on Linux system and more that can be ...