I'm sick right now, so I'll present you some games, that I play to relax now and that you could also do a let's play on!
I also have to take some pills, because I'm sick...
1. Forge of Empires
The logo of Forge of Empires
Forge of Empires is a browser-based strategy game developed by InnoGames. The open beta phase started on April 17, 2012. By 2013, the game had 10 million players. It was later released for the iPhone and iPad in 2014, as well as Android in 2015. The game is similar to both SimCity and Clash of Clans, but includes turn-based strategy elements.
I really like playing Forge of Empires and pretty much building your own empire... I think, that you could also turn it into a let's play, if you would document your process of building your empire. In addition, you could also get some active viewers, that also play the game and grow with you.
TribalWars (TW) is a browser-based, real-time strategy, massively multiplayer online game set in the Middle Ages. The game is set with each player starting off controlling a small village, with the objective being to slowly expand and conquer new villages through the formation of complex armies and a tactical combat system. The game incorporates multiple components of teamwork, planning, and strategy. The game allows players to collect resources, build armies, construct buildings, combat other armies (players or neutral), and conquer new villages. The game also allows for a level of player-specific customization, in regards to village names, army types, and troop-counts. The game operates under world-specific settings that vary from world to world.
For Tribal Wars 2 it's pretty much the same like for Forge of Empires. It is a lot of fun to play and it is also relaxing. You could also use it to document your progress in becoming better and better quite well. And you would also generate viewers, that would always come back.
This video from a German YouTuber Spieletrend is quite a good walkthrough through Tribal Wars 2. It covers all content of Tribal Wars 2. You could also upload a walkthrough like this.
Grepolis (Also Grepo) is a browser-based strategy game that was released by InnoGames In 2009. The game Turns the player Into the ruler of a small Polis In the ancient Greece . Various gods help the Player to gain control over their own island, neighboring islands or more. Around 25 million players spread across various servers in Countries all over the world play grepolis.
And again the same for Grepolis, it is a very simple and relaxing browser-game, that anyone could do a let's play on. You can start to build your own kingdom with all your viewers and use surveys to let them decide, what to build next. This way, you could build yourself constant viewers, that always come back.