Do you ask the readers which games THEY like best or which games might suit YOU? If the latter, please give us more information.
I can see that you already played Tzolk'in, Great Western Trail, Puerto Rico and El Grande. Which of them do you like best and why? If you liked some game, it might be worth to find out about other games of the same designer. Are you interested in specific mechanisms or themes? Is the time it takes to play a whole game important to you?
Generally speeking, I'd say there is one main difference in complex games: strategy or tactic. In strategic games (like Tzolk'in) you can plan forward for several rounds, because the information you need is open. In tactical games there are short time changes (often caused by cards, like in El Grande, or blocked actions, like in Puerto Rico) and you have to play more flexible.
Some other games on BGA which could be interesting for you:
Agricola, The Castles of Burgundy, (Lost Ruins of) Arnak, Barrage, Tapestry, Gaja Project, Through the Ages I + II, Clans of Caledonia, Marco Polo + Marco Polo II, Russian Railroads / Ultimate Railroads, Teotihuacan, Yokohama, La Granja, Troyes, Nippon, Chocolate Factory, In the Year of the Dragon, Homesteaders, Assyria, Signorie, Dungeon Petz, Chimera Station, Tinner's Trail, Hawaii, Madeira, The Ruhr and maybe more...
I think this list (manually extracted by me from the all-games-list) is sorted by popularity, so if you are interested in finding players easily, prefer the ones which I suggested first.
I am a tactical player, and my favourites out of these games are Puerto Rico, The Castles of Burgundy and Troyes