Advice on how to fix rating?

October 22 was my first day delivering packages for flex, I did not know that if you bring packages back to station because of not getting access to buildings or business (after hours), you get dinged for it, which I learnt from the people of this community. So thanks to all of you.

Then I started delivering packages in the hidden areas and sending pictures selecting front door or another safe location. I have delivered every package on my end. Now come is it my fault if the customer did not receive the package? May be it got stolen from outside the building? May be the customer is lying to get a refund or another package? Who knows!

But what can I do in this case? I am stuck between HAVE TO DELIVER THE PACKAGES NO MATTER WHAT and CUSTOMERS MUST RECEIVE PACKAGES.

Also, will my rating improve with the time? Can I actually ask customers to leave me a rating like instacart?

Please help me out as this is my side gig and I just started and barely get any blocks. My rating was mid great, now it is sitting at upper fair.