I built a split keyboard recently (Sofle) and it's made a huge positive impact for me. Having halves at shoulder width and full control over the layout with QMK is great, and it finally got me to learn to touch type. If you're considering a Moonlander or Ergodox, and you're handy with an iron, look into building one first.

It generally works out cheaper than prebuilt, but I did end up nickel and diming myself making arbitrary improvements. A good read if don't you want to get sucked into the ridiculous prices of custom keyboards like I did: https://golem.hu/guide/budget-builds/