I would not look into the M-series cameras. R-series is the future.
Definitely would recommend the EOS R7. A kit that includes the RF-S 18-150mm f/3.5-6.3 IS lens is $1,899 at B&H Photo.
What lenses do you currently have with your 7D? If they are Canon lenses, they would most likely work with Canon's EF to RF adapter ($100) that would allow you to use them on an R-series body.
You can also look at the more affordable EOS R10 or much more affordable EOS R50 as well. But I feel that the EOS R7 would better match feature-wise to your existing 7D.
Which lenses do you currently have with your 7D?
What lenses do you currently use? We have a budget. Do you want a full frame sensor or continue with an APS-C sensor?
Coming from a 7D, I do not think you would like an M Series body. They are small. They are more along the lines of a pocket camera for travel, which is mainly. how I use my M3. The R7 would be my recommendation for an APS-C sensor body. The R8 or even the R6 would be my recommendation for a full frame sensor body.
I don't know which lenses you currently have, but be aware that if you have any EF-S lenses, that you will get less detail out of them on a full-frame camera than you do on your 7D unless the resolution of the full-frame sensor is at least 2.5x the resolution of the 7D's. In other words, if you want to preserve an investment in EF-S lenses, you'll definitely want to go with a crop sensor mirrorless camera.
My vote, R7 as well if APS-C. 👍
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