Great going brother. While there are endless possibilities in the mind of a car enthusiast I’d just like to chip in my two cents:
I personally believe that you’ve achieved a lot since the day you started in the cosmetics department. Tweaking here and there is nice and refreshing but beyond that will take the ride into Ricer category IMHO.
If you must spend, then do it wisely in ways that will make your drive “more enjoyable and reliable”. For now, I think an exterior detail would make it more appreciable.