manualy bold a font

Beyond adding a stroke, you can't...and it won't look good.

From the sound of things, you didn't think this through thoroughly before beginning with this project. My suggestion: start over with new fonts that have been tested. Will it be a lot of work? Maybe, but in your other posts I've asked you share more than small screenshots and you've ignored those requests and without them, we're not really able to offer more than guesses.

Hi Hendy,

This is just my viewpoint, mind you, but if a typeface does not have a bold version, then don't bold it. Instead, choose a different typeface family that does have a bold version. Other possibilities are to change its color or apply an underline. I don't like any of these possibilities, and this last one most of all: Apply a Character Style to the word that defines a stroke color (which likely would be the same as the fill color) and also defines a stroke thickness. It will look bolder, but it will also look terrible. Bear in mind, this is just my opinion.