Hi there,
This seems like quite a fun project that you have! I have many games that I am familiar with and can regard myself as an expert, while having some that I simply love to play. If the criteria of games that you are considering are broad, I can name many. Within PC games, I have hundreds - thousands of hours playing Dota 2, CS:GO, Rocket League, and Gary's Mod. For tabletop gaming, I enjoy both playing and dungeon mastering Dungeons and Dragons (DnD). Finally, with MMORPGs, I have around ~300 hours of gameplay in RuneScape. I can provide proof of hours spent in most of the games, except one, that being DnD. I can, however, show you proof of my investment into the game, such as books and dice purchased for it.
After spending years writing academic papers, I can faithfully assure you that I have a knack for writing. Additionally, since these are games that I feel passionately about, I will be able to have a fast turnaround time for you for each article, depending on the length.
I am looking forward to working with you,
Harith