I want to use a word which means constant in this context, which is kind of in negative sense
Opportunities/prospects, in the beginning, in this company are massive, but after a few years growth will be constant.
Basically what I am trying to imply is that after sometime things will be very boring with no new opportunities just the same thing over and over again. Synonyms of constant like steady, stable don't really work for me as they have, in my opinion, positive connotation while I want words with negative connotation?