Games like Conquest
Games like Conquest include Company of Heroes 3, Blood Bowl 2: Legendary Edition (Classic), Dota Underlords, Root, and Blood Bowl 3. We matched them by the tags players give Conquest on Steam (Strategy, Board Game, Wargame, 2D, and Turn-Based Tactics): closest matches first, and among equally close ones the better-known games.

Company of Heroes 3
Shared: Strategy · Wargame · Singleplayer

Blood Bowl 2: Legendary Edition (Classic)
Shared: Strategy · Board Game · Multiplayer

Dota Underlords
Shared: Strategy · Multiplayer · Turn-Based Tactics

Root
Shared: Board Game · Strategy · Wargame

Blood Bowl 3
Shared: Strategy · PvP · Board Game

Bloons TD 6
Shared: Strategy · Multiplayer · Singleplayer

Axis and Allies 1942 Online
Shared: Board Game · Strategy · Wargame

Twilight Struggle
Shared: Strategy · Board Game · Wargame

Sid Meier’s Civilization® VI
Shared: Strategy · Multiplayer · Singleplayer

The Escapists 2
Shared: Strategy · Multiplayer · 2D

Gremlins, Inc.
Shared: Board Game · Strategy · Multiplayer

100% Orange Juice
Shared: Board Game · Strategy · Multiplayer

Plague Inc: Evolved
Shared: Strategy · Multiplayer · Singleplayer

Richman 11
Shared: Board Game · Strategy · Multiplayer

Mechabellum
Shared: Strategy · Wargame · PvP

ShellShock Live
Shared: Strategy · 2D · Multiplayer

Rento Fortune: Online Dice Board Game (大富翁)
Shared: Board Game · Strategy · Multiplayer

Mount & Blade II: Bannerlord
Shared: Strategy · Multiplayer · Singleplayer

Warhammer 40,000: Gladius - Relics of War
Shared: Strategy · Multiplayer · Wargame

UNO
Shared: Board Game · Multiplayer · Strategy

Hasbro's BATTLESHIP
Shared: Board Game · Strategy · Multiplayer

Through the Ages
Shared: Strategy · Board Game · Multiplayer

Heroes of the Three Kingdoms 7
Shared: Strategy · 2D · Wargame

Total War: WARHAMMER II
Shared: Strategy · Multiplayer · Singleplayer