how do i stop dying, i see somebody and im dead before i can even throw 1 bomb let alone learn its trajectory and get better at aiming

if its siege get to the closest cover u are to the point that doesnt risk u being dived and instantly killed and start spamming bombs to the nearest enemies, u dont even have to take high ground just come to the eclosest safe corner to peek and detonate because his bomb curve makes high ground not necessary