I need some feedback on whether there is actually any point playing these such small stake games if I am trying to make money off poker.
The short answer is no. You are never going to win meaningfull money at 2NL, especially not when PokerStars has limited multitabling to 4 tables. Players are also not quite as bad these days as 15 years ago, where you could just 24-table on autopilot and get a decent hourly winrate that way. Plus there has been inflation and so on and so forth.
Even Blackrain79, who got famous for doing this, do not recommend it as a strategy today. If you want to play poker for profit, you need to get to 10NL at a minimum, and even then the profit is only meaningfull, if you live in a low salary country.
I deposited $25 and i've only played a few couple of hour sessions and my bankroll is at $26.50. Should I not just try the next highest because I find it really boring at the amount of money I'm winning.
Well in that case I have some bad news for you. To play poker for profit, you need to be a winning player, and to become a winning player requires a lot of practice. Maybe 100.000
hands before you can really say for sure. So you have a lot of work cut out for you.
If you find 2NL boring, there is no problem with praticing at 5NL, but you are still not going to win a lot of money there. And you also need to set some more money aside. At a minimum 100$, and 150-200$ is better. Otherwise the variance will almost certainly wipe you out.
Finally stop seeing 26,5$ as a "bankroll". A bankroll is an amount of money, that cannot easily be replaced, and which you therefore need to protect. 26,5$ can easily be replaced, so its not a bankroll. Its just some random meaningless amount sitting in your poker account right now.