At this point it's probably good if he continues with more tariffs. If these were all suddenly removed tomorrow his base would still believe he knows good economic policy. More tariffs will continue to hurt the economy decisively showing them how bad these isolationist policies are.
Obviously the economy will be hurt by tariffs, but that's the point and a worthwhile sacrifice for a sustained healthy economic policy in the future.
My biggest concern isn't martial law, it's the crazy gun-nuts on the other side drinking Trump's Kool-Aid while still flying their Trump 2024 flags on the back of their pickup trucks. They're itching to just run over a bunch of liberal protesters if several of my coworkers are anything to go by (I'm in a very red state).