Cannot boot into macbook pro - Cannot access recovery mode
If you have access to a working Mac, the next thing I would try (after what you have already done) is to start the troubled MacBook Pro in Target Disk Mode by powering on the computer and holding down the T key until the Thunderbolt (or USB) symbol appears on the screen. Then connect it to the working Mac, mount the drive, and use Disk Utility to to verify and, if needed, repair the drive. Also take this opportunity to make a copy of the drive in case (a) the drive is failing or (b) you end up with a repair that includes a new drive. Obviously if Disk Utility cannot repair the drive, take it to Apple for service.
If the drive appears good but the computer still will not boot, the next thing I would try is running Apple Diagnostics by turning off the computer, turning it back on and holding down the D key while the computer starts up. If any issues are found, Apple Diagnostics suggests solutions and provides reference codes. Take note of those reference codes and give them to Apple when asking for service on the computer. Note that you need to be connected to the internet to run diagnostics. If D does not work (possibly because there is something wrong with your disk drive) you can use Option+D to load the diagnostics over the internet.
If the diagnostics show nothing wrong and the Target Disk Mode show nothing wrong with your drive, I would be pretty surprised. In any case, having made a backup of the drive from Target Disk Mode, if Disk Utility did not get the drive back into bootable shape, I would take the computer to Apple for repair.