In order to differentiate between a positive mindset and toxic positivity you need to be aware of your motives and check them with your moral codes. if it is malicious in intent that it is toxic, if it however is pure in form and truly heart felt then you will be in good standing.
Use forgiveness to move on from your past by allowing yourself to recognize the parts you played in situations, not the faults of others. You dont have to forgive them who you have to forgive is yourself.
Uncertainty can be devastating to ones life however using a positive mindset to compound on uncertainties greatest enemies of perseverance, discipline, and trust all of which when combined create faith. Faith brings me past uncertainty.