The best way would be to add an external flash drive flash drive or for larger needs, an external SSD drive. Much cheaper than paying for data migration, an internal seive and the fee to make a copy of your current drive and installation.
Geek Squad would be able to help with most basic problems. You will likely need to make some choices about what content to keep, while they can easily remove past or duplicate install files and other common sources of storage woes.
Geek Squad is what you need
Thanks! Your answer is awaiting moderation.