New player - how to avoid leFH?

I am a new player in the game, just started playing with some V tiers I researched, but I'm getting constantly harrassed by the leFH artillery. I noticed it is a premium tank but holy crap, isn't 8 seconds of reload on a tank that can be on the other side of the map too little? Each game I'm getting derailed by that and my repair kit is on cooldown, I just die. I can be hidden behind a stone, unreachable to other tanks but this thing just still keeps shooting me. What are the strats to avoid it, and how am I supposed to escape the stunlock? Thank you in advance!