It's the opposite. If you already have a job, you can give no fucks during interviews and show a lot of confidence because at the end of the day, you have a job. Many companies view people more highly if they are currently working than if they are out of a job and looking for one.
It's really not that hard. You set aside like 30 minutes a day or so. Maybe, do it on your lunch break. Make a generic resume that you can make some changes to tailor to the job duties of the job you are applying for. Send out like 2-3 resumes a day. Sites like indeed.com can make shit fairly easy.
If I was not actively looking I wouldn't send out 2-3 per week, much less 2-3 per day. There are not 2-3 jobs per day posted that make logical sense for me in my market. That's honestly a significant commitment, if you are doing it right by tailoring your resume, writing cover letters, etc. if not, there are high odds that you 2-3 resumes are never even being read by a human being.