A lot of the value in mascara comes from the brush. If you find a brush that works for your lashes, save it and clean it after you finish the mascara it came with. You might be able to then buy a cheaper mascara and replace its brush with your salvaged brush to make it work for you!
Take a drop of primer oil (or coconut oil to save money) and add it to a matte full-coverage concealer to make it more radiant, easier to blend, and look more like skin without messing with the coverage.
I see YouTubers use stark white concealers under their eyes, and it might look great on camera, but it does NOT in real life. It’ll just make your cheeks look too flushed and your under-eyes look white.