Upgrade SSD and RAM 13-inch MacBook Pro (non Touch Bar)

This is the same problem you face when you need a bigger engine in your car. Upgrading the one you have is essentially impossible.

You can convert your current computer to Cash by selling it, and use the cash to buy a computer that better meets your needs.

You can purchase a external hard drive - there are some very small reasonably priced bus powered SSDs. Even so that rather takes away from the convenience of a notebook unless there's data you can conveniently leave at home. The best choice, if you have the financial ability is to sell it and purchase a new or Apple refurbished computer that fits your needs today and for the next several years.

If the MBP is newer than 2015 no, it is not upgradable.

You can’t upgrade the RAM, it is soldered to the logic board. You can’t replace the SSD with a larger one, your only option would be external storage