If I add my opinion here :3
Sombras Problem right now are bugs, Consistandsi on Hack, Downtime from the speed nerf and teamplay
On how to fix these I talked about it in here: The 4-Step plan to buff Sombra (Facts and Opinions) and bug wise there are a lot more in 1.26 I talk about them here: Even more Sombra Bugs in 1.26/1.27/1.28 [With Video's] - #8 by SchWiniX-2357 and I want people to be awair of these.
I personally could live with TL at 5hp but it would be nice to be either higher or indestructible for enemies but its not needed for me (imo) atleast.