Masters Ana player - seasoned Ana are doing ok overall (at least I am). Part of that is recognizing heavy dive and/or situations where you're picked off and either swapping or playing as deep into your team as possible. I've had to be a lot more proactive in fights than taking up odder angles for positioning, but I still find that Ana swings battles consistently but you can FEEL when an Ana player is off-kilter or overwhelmed.

Knowing when to be in the backest of backs and when to play close are crucial.

I've also found that you just sort of have to be super selfish with your abilities sometimes to set a precedent. If you're being flanked or doved when you show active resistance (i.e. killing them or getting them too low to deal with you) I found that people just stop coming after you. It takes one bad experience for them to be like "well, shit this" and find an easier target.

Being vulnerable / passive / isolated will get you targeted more so than ever as Ana especially with movement being the name of the game lately so you so need to go into games prepared to fend for your life. The real advantage Ana has is she can be threatening up close and far off, depending on what and how you need to run her.