There is no verb after “because“, so here we can use “because of“.

• The government is worried because of the increasing number of people without job.
• The government is worried because of the increasing number of jobless people.

Increase is an active verb while think, depending on the context, can be an active verb or a stative one. When you say, “Menurut kamu ideku bagaimana?“, you’re actually asking the person you’re talking to about his or her perception about your idea. The person doesn’t need to use his or her energy to respond you. The person will just reply you by what he or she perceives. In this case, think is a stative verb and it should never be in a progressive form.

• What do you think of my idea? (Correct)
• What are you thinking of my idea? (Incorrect).

On the other hand, if you say,

• Please, think harder!
• What are you thinking?
• I am thinking of your idea whether it’s good or bad.

then think is an active verb because there’s an action. Here, energy is needed and sometimes it’s followed by the falling off your hair. In this case, it can be used in any tense.

For a more detailed discussion, please see “Simple Present tense vs Present continuous tense“.