Hi @gertrude13230
Here's the service manual for the Inspiron 7425 2-in-1 laptop.
Go to p.44 to view the procedure to remove/replace the systemboard in the laptop
This is required to enable you to either re-solder the USB-C charge port¹ or to replace it if necessary. (supplier example only to show the part).
You will need smd soldering skills and tools to perform the task. Not easy to do if you're a novice as the port has numerous pin connections that are very close to each other. Here's an example video that shows what is involved when having to remove/replace smd components.
If doing this seems a bit daunting, perhaps if the USB-C connector is just loose and not damaged, disassemble the laptop and take the systemboard (handle with care) to a reputable, professional laptop repair service or mobile phone repair service and ask for a quote to solder it back onto the board.
If it is damaged, source a replacement USB-C connector and then once you have it, take it and the board and get a quote to remove/replace the original.
Doing either of the above should minimize the cost of the repair as the repairer doesn't have to disassemble or reassemble the laptop or source the required part if necessary, thereby saving time which would be (or should be) part of their price. Also they have the requisite tools and skills to perform the repair.
Since you are doing the disassembly/reassembly their guarantee would only be for their work and not anything else to do with the laptop.
¹ According to the setup and specifications guide for the laptop, it has 2 x USB-C ports on the left hand side (see p.6), either of which, if I'm reading it correctly should be able to charge the laptop as they both state, in part "Supports Power Delivery that enables two-way power supply between devices". Have you tried using the other USB-C port at all?