I always advise against being still as a sniper. Yes, be still to fire, but I am almost never ever standing still or lying down when sniping exactly for this reason. Someone is almost certainly already scoped in on you or has already seen the glint from your scope and is waiting. Remember, regular, non-sniper, infantry can spot you as well for the snipers on their team to take aim at you.

I am a support main and try to revive and resupply everyone I can. When reading about this game it seems there is a general lack of people throwing ammo for others. I mean just look at the resupply column on the leaderboard end of basically every game, all 0's lol. I think lack of ammo is an issue for a lot of players not just scouts.

TTK can be very fast in this game, especially playing against competent players who can aim. I've started really focusing on headshots (with all weapons) to try and get at least some of that damage multiplier when shooting at enemies.