If you're starting a new career, I'm not sure the info you will find on Glassdoor will speak much to you either (or, not as much as when you already have had one or two positions - because then you know how to interpret some signals companies broadcast through their ads, or their employees reports).
And looking after COBOL (or an old tech, without having been introduced to it before) as an entry job is a bit peculiar.
Better looking after the companies that still need it, understanding why, and then going through them for specific jobs, linked or not to COBOL.
I understand the appeal of getting into it for the technology or the money, but getting into it for the problems and how to solve them first will open many more paths (and as much if not more money).
And looking after COBOL (or an old tech, without having been introduced to it before) as an entry job is a bit peculiar.
Better looking after the companies that still need it, understanding why, and then going through them for specific jobs, linked or not to COBOL.
I understand the appeal of getting into it for the technology or the money, but getting into it for the problems and how to solve them first will open many more paths (and as much if not more money).