My country is becoming much like yours now, as our rights and freedoms are quickly becoming stripped away, in favor of an ideology born out of lies and disinformation, but enough about that lets talk about your plant;
that fertilizer is fine but it has no calcium or magnesium, you can supplement magnesium with epsom salts I'll get back to you on what will work for calcium
Agree with above, feed with plain water for a few waterings, I understand you can't set the pH or PPM without the proper equipment, I use Aquarium pH tester drops to adjust my pH but not sure if you have it available or not
Also water using double the normal amount of water to try to flush out some built-up salts which I believe is what's causing your issue, I run double the amount like this through every one of my plants approximately once every week to keep the salts from building up
View attachment 1052048
Edit: sources of calcium
Plants, like animals, need a range of mineral nutrients. Nitrogen, potassium and...
homeguides.sfgate.com
Not sure what's available to you, if you have Dolomite lime available it will both provide calcium and also will raise and buffer your soil pH