putting or placing something "on the front burner" means that it is important, or a priority. (an unimportant event or person could be said to be on the "back burner") From the setup of a cooking range, where items on the front burner are closer to you and can be watched over more easily and effectively.

Got the covid-19 vaccine

Something of higher priority.

1. an attractive female, so hot that she is the large, front burner on the stove.

On a soap opera, a story that gets coverage everyday.

used in the phrase ‘on the frontburner’ to denote a process that is being pushed forward. Antonym of ‘on the backburner’.