I have already use some plugins for some feature that should NOT STOP WORKING if you install some other plugin for this task, like
Hosting: Hostinger Business Web Hosting
1. CodeMirror Blocks
2. Enlighter - Customizable Syntax Highlighter
3. LearnPress UI and Feature
4. OneSignal Push Notifications
5. Embedd of Youtube video should not stop working
Plugins I am already using for better speed.
1. a3 Lazy Load
2. ShortPixel Image Optimizer
3. Some other things my developer did, but he is not available to work currently.