First, you need good writing frameworks.
Use https://typeshare.com for writing templates
X / Twitter Schedulers
Hypefury is a good choice for X
Typefully is another good choice for X
Meta Threads Schedulers
*Both of these are still a work in progress (as of 24 Apr 2025)
BlackTwist.app
https://www.schedulethreads.com
Performance + Improvement:
Threads also has your insights and post performance built into it.
Post as much as you can and then double down on working posts.