i want to send a transaction and make it final with RBF disabled
That is not possible, and it never was in the first place.
When your transaction has 0 confirmations, it is by the protocol not final. If you're referring to the mempool policy rule before full RBF, then it is neither possible. Almost all nodes will have upgraded to Full RBF by now, and even if full RBF nodes are a tiny minority, it's enough to reach the mempool of the mining pools.
thank you for answering
is it possible to have a transaction confirmed in few sec
by putting the higher fee on the time
by saying final i meant with no possibility to rteplace it with another one