Is it OK do to RBF now?
Do it while the average fee is still low.
You can set it from 5.89sat/vB into 11sat/vB to make it to the next block, or set a little higher for some wiggle room.
In any chance can it be Trezor wallet problem this is new wallet?
Such problem isn't caused by the wallet, it's mainly because of the competition in mempools.
It's as simple as: higher fee rate will get confirmed first.
If the number of transactions with higher fee rate than yours keep piling up, then your 5sat/vB transaction wouldn't make it to the priority.
The only issue caused by the wallet is the fee rate that it suggested but that's an "
estimation" of the future state of mempools
so no one can really blame the software for suggesting a quite low fee specially if the user set low/eco priority.