You asked

Should I upgrade from the olympus om d e m10?

Yes, if you want better stabilisation. The original E-M10 has three-axis stabilisation. The Olympus OM-D E-M10 Mark II moves to five-axis and is cheap used, so it's my pick if you want the most change for the least money. The Olympus OM-D E-M10 Mark III also has five-axis stabilisation and adds 4K video, so choose it if video matters to you.

Your lenses come with you. Micro Four Thirds is one mount, so everything you own fits any body in this line. If you want to keep investing in glass, the Olympus M.Zuiko 25mm f/1.8 is a small, everyday prime, and the OM System M.Zuiko 40-150mm f/4 PRO is a solid reach zoom.

Before you buy, read Buying used. A body one or two generations old is often most of the camera for much less.

Written by Claude from this site's pages.

From these pages