“Should” is one of the most common ways to recommend something. It’s strong but so frequent that listeners will not feel offended if you use it.
“You should eat healthier food.”
“You should leave home earlier to avoid the traffic.”
“You should change jobs. The environment at your office is toxic.”
Could you apply it in business? Yes. You can use “should” for recommendations at work. It’s direct, polite and easy to understand.
Also, sentences with “should” follow a simple structure (should + infinitive) so you’re not likely to make mistakes.
“We should use “should” for recommendations!”
“Tom should start the project right away.”
“They should check their cashflow if they want to be financially stable.”
Read Andrew D. Miles’s books on business English here: www.andymiles.com