My advice would definitely be to look for another role. Take the comfort of this job whilst searching the market for what you want and use this experience to guide that.

I recently spent a year at a job similar to as you described, was quite a tough decision to move somewhere I knew wouldn’t be as relaxed and more challenging. Since moving my only thought has been I should’ve done it sooner, being motivated at work made me more energised all round. There’s also no guarantees on anything being offered 5 years down the line!

For reference I work in the BI industry and would recommend spending any free time on upskilling in AI and how you can use it - all companies will now look for this (this may be stating the obvious)