Yes, manufacturers are moving from DSLRs to mirrorless
Only a few models are still being made by Canon & Nikon.
Sony is fully mirrorless now, I think
But that doesn't mean you shouldn't get one or your DSLR is expired
If you get a DSLR today, that would still be resellable even after 10 years.
I am not an expert
I have a DSLR, that's all
DSLR
cheaper
heavy ( ~ 3X times than mirrorless )
the shutter is at the top of the sensor ( this is an advantage, the sensor is not directly exposed to the outer world when you unplug the lens )
plenty of lenses available at a decent price
most of them got weather seals (beneficial in outdoor photography)
more battery life
Mirrorless
latest tech
expensive
lighter
direct exposed sensor ()
lenses quite expensive & limited ( compared to DSLR )
lesser battery life
a good quality camera has features like,
Full frame sensor
more pixels
more focus points
more support at low light conditions
more image stability
4K video
etc ( google them )
The higher the price, the higher the features
affordable means fewer features.
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I got a DSLR because I use the camera for outdoor activities
weather seal, more battery, more lenses at cheaper prices, the body is cheaper too
In your case, I think mirrorless suits you