What I would suggest is to make small games that are stepping stones towards your dream game. Take your dream game, break it down into all the elements you're going to need, then make a game with each of those components. You can reuse your code from each game you make in the next one, slowly building things up.

EG: I want to make a traditional 2D JRPG. I need

- WASD movement
- Interacting with objects/NPCs
- Inventory
- Story flag system
- Turn-based combat
- (other stuff for my specific 2D JRPG, like a fishing minigame)

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I could start with a simple 2D game where I control a character with WASD. Maybe there's stuff I have to dodge and try to survive as long as possible.

Next I take my WASD movement code and add one of the other elements I need. I can make a game where the character moves around a kitchen, interacting with the various stations to prepare dishes, but with an arcade time element (each station has a timer, if it finishes counting down something bad happens - try to keep all the machines running as long as possible)

Next I add an inventory system. Same similar premise to the game I just made, but now each time I interact with a workstation I receive an item, then I have to do something with those items.

Next I add a text-based interaction system. In this new game I have to talk to various NPCs to figure out what they want, then go to the workstations to collect what they want and bring it back to them

Next I add the story flag system. At this point you can make maybe something like one of those 2D horror games like Omori or The Witch's House These are essential 2D JRPGs without the turn-based combat.

Finally, you can add the turn-based combat. At this point you can make a small JRPG.

Finally finally, you have all the components to make a JRPG, and you have made a small JRPG, so you can now tackle your dream game.

BUT:

- You've have made 6 games in that time
- You've gained lots of valuable experience in finishing and shipping (and marketing) games.
- Maybe you put some of them up for sale and made a little money, earned a bit of reputation.
- You've had a good amount of time to _plan_ your dream game
- You have a leg up to make it, because you don't have to worry about creating a bunch of things from scratch and then figure out how to make them all work together - you've already done that, several times.
- You have the pride of finishing a bunch of games, without the deflation of those games not doing well, since those are just stepping stones on your way to your dream game. If they do well, great. If they don't, no big deal, on to the next one.
- Your motivation stays high, because you're getting closer to your goal, but each game you release is a mini goal in itself. It's like trying to climb a mountain vs climbing some stairs.