Hi, there are 2 easy ways to remedy this:
Add a shortcut of the Finder to your home screen. When you tap it, the Finder opens and the keyboard is activated immediately without need to tap into the search field.
How to add Finder to your home screen?
1. Swipe down on a blank area of your home screen to access Finder.
2. Tap the 3-vertical-dot menu button in the top right corner.
3. Tap Finder settings.
4. Switch the toggle next to Add Finder.
Install Evie launcher. The best free launcher I've come across and been using the past two years.