https://www.businessinsider.com/high-paying-competitive-jobs-2017-7 and https://www.lovemoney.com/gallerylist/68296/the-20-most-competitive-jobs-in-america-right-now give you an indication.
Another take is how competitive are your co-workers and https://www.businessinsider.com/most-competitive-jobs-in-america-2013-12 has a view of that.
My personal view would be which jobs are hardest to get hired for. https://collegetimes.co/11-hardest-jobs-to-get-in-america/ has list of those. Some of these surprised me.
Lastly, which jobs employers have the hardest time filling https://kressinc.com/top-10-hardest-jobs-fill-year-weekend-roundup/