May i ask what your average relative position is?
From what i can see you are actually performing a fair bit above average so this might just be a bad streak in combination with focusing to much on the negative results (which is just a built in human survival mechanism/reptile brain thing, bad experiences stick better to memory as those are biologically more important for survival).
As for actual tips those depend on what vehicles you are playing as most vehicles have their own small tips and tricks for how to utilize them better.
My personal general tips though:
Ground RB:
I have found the best results when playing neither extreme of aggressive/careful as a blanket but rather situationally instead. So start aggressive to get to a good spot then be careful to try to pick off those who are aggressive all the way at the start of a match. once those are gone (either shot by you or your team) then time to start pushing again and be aggressive towards those who are careful all the way (and/or those who are careful at the start but get impatient). It’s so very situational that there really isn’t “one good strategy” that always works.
I have also found that spawning SPAA relatively early has worked out better as you have time to move from spawn before the wall of CAS appears early mid-match, you then have a better position as those planes will likely be looking for SPAA in spawn (where you are no longer at) and you have an easier time ambushing them. Spawning SPAA when there already is 3+ planes up at the same time will increase the risk of getting knocked out in spawn while only taking down 1 plane if you are lucky and fast before the spawn protection runs out.
Air RB:
Depends heavily on the BR, any jet with IR missiles but at or below ~11.0 BR (but this works for many other BR’s as well, just not for the really high ones where radars are way more likely to spot you and shoot you down at altitude) does surprisingly well if you go out just a tad bit slower than the rest of your team, climb to just below where the contrail appears (differs from map to map but mostly around 5.5km plus/minus 0.3km) and then diving down to behind the base bombers that rush bases at the start. No need to dive all the way down either, as long as you are behind them and above them you can fire a IR missile at their engines decreasing the risk of flares working and increasing your chances of not being seen as you come from above. Then climb again and repeat once more (i usually get one or two of these opportunities per match at those BR’s).
After that it highly depends on the plane, but doing zoom/boom after that as well still works in many situations where the enemies are in a large ball together with your allies and you dive in and gun down the slowest of the enemies and them fly out (don’t get baited into turn fights early, you’ll just be food for their teammates that do what i just described). At this point in the game IR missiles (and radar as well for that matter) are almost always a no go, to high risk of teamkills. If you still have missiles save them for when there is way less enemies (and friendlies) and you can more accurately judge the risks of accidental teamkills to shoot a missile at a slow turn fighting enemy or one that has just exited the main area and is trying to fly back to base to re-arm.
General RB:
No matter the game mode, keeping a cool head and staying patient has (at least for me personally) paid of more than anything else, don’t go for the first target you see (unless they have already seen you). It’s often better to wait for a better shot a few moments later than to take an unnecessary pot shot at an enemy that didn’t even know you were there and miss or not do enough damage, instead of waiting a few seconds and having a free shot at weakspots because they turned a bit.
Of course you’re gonna have matches where you get knocked out having done absolutely nothing, those are unavoidable, best you can do is aim for less of them and try to not let them get to you emotionally, you can do everything right and still have those matches. Not worth beating yourself up about it. Aim for a higher average instead of great games all the time as that realistically isn’t achievable.
Sorry for the wall of text, i’ve tried to space it out best i could :)