Try this machine applique technique that resembles hand stitching, the finished look is similar to hand-sewn applique where stitches are barely visible along the edges of the appliqué shapes.
BERNINA: Invisible Applique
invisible applique by machine - 30 second short
Stitching Sewcial
Invisible Applique with Open Embroidery Foot #20/20C/20D - WeAllSew
Invisible Applique with Open Embroidery Foot #20/20C/20D - WeAllSew
4-1/2 Left-Handed Mini Duckbill Appliqué Scissors
Invisible Applique with Open Embroidery Foot #20/20C/20D - WeAllSew
Blanket Stitch Appliqué with BERNINA Open Embroidery Foot #20/20C/20D - WeAllSew
21) BERNINA presser feet -- Open embroidery foot #20/20C
Three Uses for an Open-Toe Presser Foot in 2023
Pellon Sol-U-Film Stabilizer, 20-Inch by 25-Yard