You have already installed quite a few plugins so far, and the number will only keep going up, especially as you try to solve problems that are specific to whatever it is you're working on. Manually keeping plugins up to date requires quite a bit of work, but luckily there are plugin management solutions out there!
Plugin management becomes even more important if you often change or switch machines and have the need to keep multiple plugins updated.
For more tips on keeping Vim synced between multiple machines, see Chapter 7, Making Vim Your Own.
The plugin management landscape is ever changing, and there's no substitute for good old research when choosing a plugin manager. This chapter covers a few plugin managers that I've used throughout the years, which will hopefully be enough for you to base your own research on.