https://www.canada.ca/en/immigration-refugees-citizenship/services/application/check-processing-times.html
You are well within processing time
So wait for a decision
MPNP nominated you for your old Express profile
Now that it is rejected, you need to ask MPNP to nominate again
Else submit a fresh EOI and wait for next LAA
This is what most people do
Your file did not pass R10 stage
Get a new PCC
Inform MPNP and send them an email
You will need a new nomination if current one has expired
Else just reapply
MPNP is very approachable as a province
Good Luck