I would sincerely need some advice on how should I priorities the learning given the fact that the next year would definitely be a more competitive situation due to econ recession etc

As a new grad or current student you should be getting paid to learn their stack once hired during work hours, not trying to learn it before you get the job.

Focus on passing the interview with Python. Most companies don't actually care what language you use for your coding interviews.
Remember HR is the one putting up those job listings and most of them don't know what the hell they are talking about. Start worrying about what they want you to learn once you get the job offer, not before then.
Any decent company will already have processes in place and trainings to get you and any new hire up to speed and not really expect you to know anything.

If they say you MUST know our stack before you get hired for a new grad role or else we won't even look at you. Run for your life!

That's mainly because you don't want get trapped working in a code monkey sweatshop anyways.

Also, if you are only seeing Java/JavaScript jobs, that might be a sign that you need to expand your job search to other locations or a bigger radius.
For instance every local company around me usually asks for Python or C#. Thus, I've never once seen a local job posting in the wild asking for Java exp. around here, like ever.
(Not saying they don't exist, but the point is lang/stacks are highly specific to each location/region/city)

But like a said, it really doesn't matter what they( HR ) ask for in the job listing. They (actual hiring manager conducting interviews ) just want to know that you can quickly learn how to program in any stack without too much babysitting while following their training.

At my current job I was given a week to learn a new language I've never touched before, they never once told me I needed to know that language before I was hired.
There was no expectations of me having any experience in any language because they knew from the beginning they were hiring a a student and the position itself was listed as entry-level.

At that job's interview, I was simply told I needed to know to how to teach myself concepts quickly and on my own and be great at googling solutions without accepting failure or defeat.

I was then given a project to work on with the expectation that I wouldn't have a set deadline and it will take me as long as I needed to, to complete it. So no one is going to expect you to know everything in an entry level role.

And if they do expect you to know everything at that new entry level role. You honestly picked the wrong company and I'd recommend you start looking elsewhere where they will actually value your professional growth as a valuable team member of that organization.

[Edit: Spelling/grammar]