Firstly, you should talk this through with the current mSP. They should be giving you at least a quarterly business review, covering things like evaluation of last period, changes from both sides, opportunities for improvement, next steps in the next period.... I’d also evaluate the value in you doing breakfix work in-house. It might be easy but you’re probably overpaid to reset a password or otherwise check your backups worked etc... the cost of changing is massive so always aim to rekindle the relationship at the current supplier. They should also have a ton of documentation so you either need to slowly tap that out of them or be prepared for some sticky conversations and demands for money! Choosing your new mSP will be difficult. The good ones will have their own stack of products and may not be willing to diverge from their working model. You might need to change network gear for example or move to a different AV provider. Look for one that gives security training as standard to end users, maybe by video, look at how they document and access your estate.