I started my first permanent academic position as a Lecturer at at UK university in Autumn 2019. More than one of my senior colleagues seems very eager to get me promoted to a Reader as soon as possible, looking out that I tick the right administrative boxes to make this happen and encouraging me to apply for promotion this month. This seems premature to me as I don't even feel like I know the my way around the university yet, and with Covid I haven't accomplished much in my research since joining the university.
My question is: Are there any reasons not to pursue a promotion? A promotion is a great thing, right? But are there any downsides? E.g. it might make it harder for me to move to a different university in a few years if I want to, or I might get saddled with more administrative responsibilities? Are there any other downsides I haven't thought of?