Not everything sold to solo players is a game you can sit down and play, and the most expensive version of this mistake is buying Ironsworn and Mythic at the same time, expecting two alternatives.
Ironsworn is a complete game: character creation, moves, dice resolution and a setting, in one free book. The Mythic Game Master Emulator is an engine for replacing the game master, built from a Fate Chart, a Fate Check and forty-seven meaning tables. Its publisher says it can be used with any roleplaying system to replace the game master, or played on its own. What it does not hand you is a character sheet, a combat procedure or a world. Bolted onto a game you already love it is excellent. Reached for as a first purchase, it leaves you still needing to supply the game.
Two other shapes that catch beginners
A multi-book line is a commitment dressed up as a starting point. D100 Dungeon, for instance, runs to a core rulebook plus numbered campaign books, a rules expansion, a companion volume and a mapping add-on, so you can be three purchases deep before you know whether you enjoy the activity at all. Its earlier print-and-play rules are free, which is the sensible way in: play the free version first, buy into the line only if it holds you.
A notebook of writing prompts is also not a game system, whatever the cover suggests. The test takes a minute in the preview: does the book tell you how to resolve something uncertain, with dice, a table or a procedure, or does it only ask you questions? Prompts are a pleasure once something else is doing the resolving. On their own they cannot run a session.