Well, one trick is to do things in exchange! Others detest the “boring” stuff – have them help you figure out what props and costume pieces will please you, and then, let them make it, while you do that other stuff in exchange.
Or buy something, second hand, to adjust and tweak as much as you like, or new by someone who has the skills and drive to create that you might not have.

Especially for scifi and postapoc, as well as modern, it’s easy to find a good base layer for clothing and props, and modify the drek out of them. Rusty saws and hammers are useful for postapoc, fabric spray paint for almost anything, stencils to get odd symbols and patterns work well, deciding on “one complement colour” that you sprinkle all over…

Honestly, second hand stores and flea markets are kind of one’s best friend. There’s no end to the stuff one can find that just turns out to fit a character, or become a focus point for getting into character, or building a costume around.

Also, take it slow, and don’t force yourself to do stuff you don’t enjoy. That just kills the enjoyment overall!

I also suggest: Look at what you have! Sometimes, an old kitchen utensil can be perfectly used for an antenna or something 😀 I also agree that sharing is so valuable! I love crafting but am not the best at organisation so let’s trade!