Is it safe to use multiple similar keywords?

[makoo]

Hello everyone,

I am trying to use similar keywords for my website but some of my keywords are not ranking properly. Can anyone help me to solve this query?

[np.carzspa]

Yes, one can use the same keywords multiple times while doing link building.

[seo.gops]

So how do you come up with multiple, related keywords that will rank well? .While there's no perfect number, generally 1 – 3% seems to be a safe range.