Should I assign certain google ads per keyword or more?

Use 3 keywords for each campaign with relevant keywords to each other to maintain high-quality result also the ad group and titles. So in your case, I think you should create 3 different campaigns and add as the following scale.

1st campaign = 3 keywords
2nd campaign = 3 keywords
3rd campaign = 4 keywords

In the campaigns, you can choose certain ads to be shown for certain keywords.

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