The one accessory that I've been using for years is a Logitech mini mouse. I've got to use an USB-C adapter for it. I almost always use my laptop in my lap on my lazyboy so the mini mouse sits on the arm of the chair. I love it. By wife thinks it's stupid. I can certainly use the trackpad but i find the mini mouse much easier.
https://www.amazon.com/gp/product/B008RMY4JQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1