2013 Ford focus starting issues

I am looking for the solution to my starting problem on my 2013 ford focus. It has 100k miles on it and I just recently bout it off of fb marketplace. It started having starting issues so I replaced the starter. That didn’t change anything so I replaced the ignition switch. Still no luck. It starts intermittently but it’s not reliable to have a car that starts only sometimes. It also will say “transmition not in park” when I slow down and when I turn my car on it always says “driver door ajar” even though it’s latched. Does anyone have any idea what the issue could be? I checked the relays already. Please give any advice