Advice please

Hi guys,

I have been in my new role as a DA for 7 months now (5 years of experience overall), but it's a foot-in-the-door situation for me. To be honest, the pay is abysmal (£27k) with a 5% raise cap. But there is another job opening in a different area of the business (45k) for the same DA roles as mine. Is it wise for me to reapply as an internal for the job, or leave the job for another one completely? Please, if any advice is available, I'm grateful.