Where can I find ideas on what to build (for fun)

I'll repeat my answer to the previous iteration[1] of this question from a couple of weeks ago:

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You might find something of use in some of this stuff:

https://hn.algolia.com/?q=request+for+startup

https://hn.algolia.com/?q=startup+ideas

https://unvalidatedideas.com/

https://www.reddit.com/r/SomebodyMakeThis/

https://www.ycombinator.com/rfs

https://paulgraham.com/startupideas.html

https://www.paulgraham.com/ideas.html

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In addition, the two videos on "How to Invent the Future" by Alan Kay might be inspirational to you (or anybody else thinking about this topic):

Part I - https://www.youtube.com/watch?v=id1WShzzMCQ&list=PLoROMvodv4...

Part II - https://www.youtube.com/watch?v=1e8VZlPBx_0&list=PLoROMvodv4...

Actually, this entire playlist is quite interesting, even if you're not looking to launch a startup right now - https://www.youtube.com/watch?v=1e8VZlPBx_0&list=PLoROMvodv4...

[1]: https://news.ycombinator.com/item?id=38923809

See https://www.abebooks.com/9780830699636/1001-things-personal-...