You need to do whatever kind of preparation your pastor thinks is appropriate.
If my pastor were to ask my opinion, I would recommend RCIA.
But you also need to understand that RCIA isn’t intended as an 8-month class that everyone sits through together. For those already baptized, the process should be as long as it needs to be and no longer. However, parishes implement RCIA in different ways and for many it really is treated as a class where everyone does everything at the same time. I guess it gets the job done even if it’s not exactly according to the Church’s vision of things.
Ultimately you will complete your sacraments of initiation and that will be a huge blessing.