Hi, EmaRacing87!
Sorry for the little delay!
Uhhm, tbh, I guess you do have some big leaks as almost all 0.5 euro players have those. But that's not helping you much. It's good you asked for opinion and question yourself what you can do better. My advice will be-watch videos, post hands here in the forum, maybe find a poker buddy and discuss ideas with him, work with ICM, pokerequilab and other useful programs. Now to the questions:
-BB 10/20, 15/30, 25/50 , you need to open up a bigger range. You are playing pretty nitty. Even from UTG, I will open more than just 4-5% of hands. Also-steal more. Especially when sitting in the CO/BTN. SB steal also needs to be bigger on average. 3bet needs to be bigger. You need to sometimes 3bet/bluff-squeeze when the situation is good for it. So all in all, I think you are playing pretty low number of hands and not being aggressive or loose enough preflop.
-BB 50/100, 100/200- I can see that there is a change you started opening up more now that the blinds pressure you. I can't really say much here as it could be misleading for you.
As you paid attention, all the results are based on a very limited sample. Paying too much attention on dry numbers can be very misleading. You just don't have enough hands to draw conclusions. Best imo what I suggested above(with posting hands, videos, sweet sessions) plus try to re-play a few tournaments in your tracking software and look for spots you think you made a mistake, possible leaks etc.
Good luck!