If so, try selling that and learn from the results. Then use incremental improvements on your process. You will probably find that even with a decent game developed, it will the marketing and sales that determines success or not - after all nobody will buy the game if they don't know about it.
The only other advice I can give is try piggy backing off something that's already a successful franchise - for example tools for WoW, Fortnite, even original Doom. For example, look at what Romero has just announced with Sigil.
Another option try to reboot a franchise like was done with Shadow Warrior and even ROTT - what classic game could do with an update? You need to make sure you square away the licensing deal of course.
You are setting yourself for a very tough challenge - good luck!