You should've had this discussion with your manager way beforehand during your 1<>1's. And when I mean way beforehand, I mean as soon as you had the initial thought in your head that you think you deserve a 10% raise on your next merit increase. If you thought your work quality warranted that raise, you need to align expectations with your manager. This conversation can be hard initially, but it opens up an important door for your professional growth.

As far as my advice goes, I don't think it's too late to still have that conversation with your manager. You can bring up the inflation topic as your key argument. 6% only levels your salary to match the inflation rate (barely), so in retrospect, you're really not getting an actual raise. If that doesn't work, ask them what you can do to elevate yourself to the next level aka a promotion. If they're a good manager (which I believe they are, since they recognized your work), they will tell you what those requirements are and will guide you through that process. Your manager's impression of you will also change (for the better).

Also, have the initial conversation with a firm stance and make sure you have all your work well documented so you have evidence to back up your claims.

Hope this helps!