What is meant to be will happen if you help it along. Sitting back and doing nothing may still lead you to the right person, but it won't mean you will keep them. That part takes effort from you to make things last.
Soulmates will find each other. They will always meet at some point in their lives.
When you find your soulmate — and don't worry about how you will know (because you just will) — do everything to keep them. Don't let them slip away, because they are the next big adventure you are destined to take.