Need genuine advice and suggestions ? Does joining as MicroStrategy Developer make good career choice for operations guy ?

I have worked in operation for long time and couple of years back I changed my account and got into role of data analysis and insights. There I worked on Microstrategy, mostly on reports to get data required for analysis. Client appreciated my work there as i was really good in data analysis. Unfortunately, that account was closed in just 2 years as client ended deal with TCS. While in RMG, I was offered a role of Microstrategy developer looking at my previous work experience on Microstrategy. I was told that, I will be given training, so i accepted the role. I am still in training mode as my client ID is not created for Microstrategy. I am told to go through videos available on internet, which is giving me understanding of Microstrategy architecture but unable to any hands on. Also, not very sure what would be my work with client. For now I have put aside all my apprehensions about what client will expect me to work, as I have accepted that it will be challenging and I will work hard to meet expectations or to learn anything. My worry is about - Is getting into Microstrategy developer at this point a good choice ? I have heard that MicroStrategy as BI tool facing problems and getting replaced by Power BI at most of places. Demand is going down and bery few companies are using it now. So I am worried now, will it like wasting efforts ?

Sorry for such long background and post but genuinely need suggestions and opinions as I am bit anxious and skeptical 😐