someone asked a Rabbi once ‘is it better to pray in english and understand it, then to pray in lashon hakodesh and not understand it?’
he said to pray in lashon hakodesh is better! .. i heard this a few times, cuz the tefillot and the words that the avot wrote for us have a lot of power and are not just regular words. of course your tefillah is 10x better if you understand it too, but one should always pray in lashon hakodesh (unless they can’t physically read hebrew i guess)