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You might need to dig around a little for animated sprite sheets, but there are plenty of good quality free 2d assets:

When I was playing around with Godot and 2D game development, I went to itch.io for free asset packs. It's hard to get a consistent art-style, but good enough for a beginner.

If you have 10 bucks lying around, the comprehensive Kenney pack is good value (on sale, usu. $20), and with consistent art styles.

https://kenney.itch.io/kenney-game-assets

(no affiliation, it's just good stuff)

If you subscribe to Humble Bundle newsletters, you will occasionally get nice deals on sound, music and/or sprite assets.

I’ve bought many nice asset bundles here for a very reasonable price.

Honestly maybe easier to just do it in aseprite, at first it will be daunting but in the end enjoyable.