Like the title the entire sentinel role is hugely unbalanced and needs changes. I think they should have balance patches for every role in a team comp and it should be sentinels time to be rebalanced.

Cypher- He obviously is the most underpowered here and with pheonix getting his fix cypher needs something, especially with split being gone. Tripwires struggle to keep 4 or 5 man rushes off sight and while sage and kj can stall and chamber can get picks cyphers trips only work when enemies aren't careful enough and you have advantages positioning through a smoke or thin wall. My suggestion is trips can only catch one but stop other enemies from moving past the wire until it's shot or the enemy dies. this way you can confidently cage and swing knowing that a second enemy isn't going to hard push through it. Cages are underwhelming when compared to a lot of other util and I feel they could be more useful to his lurking capabilities. My idea is to encrypt teamates inside cages making them immune to reveals and invisible to dogs, drones, and cams. The cage would still be visible, but it would allow for a lot of outplays and tactics. Neural theft A lot of people talk about how cypher ult should have a tracking scan but I feel like that might be a bit overboard of a change. Yellow reveals need a QoL change, when you peak someone revealed orange they aren't still glowing when they're in LoS. The same thing should happen with cypher ult where the yellow reveals should disappear while in LoS to clear clutter from the screen.

Killjoy She's effective on the right map and her base util doesn't need changes. She has been power crept out of the meta for most maps so she should get a small buff to make her less counterable. Lockdown, Her ult has a glaring weakness where a lot of util will break it with no counterplay or benefit to the Kj. I propose when her ult is broken by any util that isn't a fast moving projectile it goes super critical and stuns every enemy within the radius after 5sec. So when Kj ult is destroyed by util it loses value but isn't completly useless.

Chamber He is become the god of the current meta and has the oppressiveness of Jetts oping and astras cooldowns. Rendezvous While you can't take away his ability to op he needs to be restricted slightly with which off angles he can take safely and how fast his cooldowns are. A 3 second startup timer on his tps would restrict chamber in this way. It would keep him from taking first contact basicly in enemies spawn and would restrict frequency between tps

Sage She doesn't need any major changes, filling her role with stalling util and I don't have enough insight to suggest stat changes.