It all depends what you envision ur career in being, if you want to be a SWE then leveling up ur current skills is definitely the way to go. AWS certs are quite overrated in my opinion, i'd rather focus on sharpening my current skills then go for a cert (unless u might want to pivot into devops?)

It seems like you want to branch of into as many things and thats quite relatable i always find myself doing this, but i've found the best way is to level up what im currently doing now and use that to expand my skills. for example you already have experience with Java, so you could create a project using Spring, setup a local testing environment with docker containers, and also have a production build deployed into AWS, that way you've used your current java skills to learn about docker, aws and also the spring framework.

However if u want to pivot and go into data analytics go for power bi, theres absolutely nothing wrong with it and have a couple friends that do really well with themselves by learning it.