There are several "continuous" soffit vents that are easy to install. Various widths from Hardie Plank. ( It or a lighter weight, easier to cut one piece soffit and vent, mebbee masonite peg board would be easiest to install.) Vinyl, similar to what you have but a long piece. Metal strip that goes in gap in length wise gap in soffit. Choose the one that looks best in your situation. Some have insect screen applied, you may have to apply your own screen, keeps bugs from going into attic or coming out into "pergola".
Do a google image search for soffit vents to see what they all look like.
Measure twice, cut once.
Look at the nail, not the hammer. Watch the fence, not the blade.
If you hook your thumb over your belt you won't hit it with the hammer or leave it layin on the saw table.