Tank is WAY more dependent on your team than the other roles so focus hard on positioning early on. Mechanics can only get u so far on tank especially so while aim and good ability use matters being a position where u can safely back up or easily push into the back line is the main goal. Play corners is a tried a true tip but it’s a little more than just that. Obv play high ground when you can but you also have to contest with there team to keep them from just walking around you. Always be harassing someone doesn’t matter if it’s the dps, support or sometimes the tank but always be a threat to some extent. Manage your health pool too and constantly be watching your supports and their positions too bc sometimes ur supports aren’t gonna move with you.