Here is some links you can use.

Images
When you use images etc. in articles then make sure theres no copyrights. You find lots of free images on Pixabay and Pexel (good for images with people for testimonials).

Meta
To spice up things in google index you can make the ads more attractive. Add Emojis in meta title & description to draw attention and current month/year, this can be done automatic when you use theese tags %%currentmonth%% %%currentyear%%