You do need to meet with the priest and let him lay out a path for you, in the proper order. There is always a way to return and make everything whole.
My husband and I came back to the Church, while living together (unmarried) and with a six month old daughter. I was lacking First Communion and Confirmation, he was lacking Confirmation, so it was an interesting- albeit sometimes frustrating- year long journey, but it was so worth the effort. We couldn’t live apart, but did abstain throughout that year, even though Father explained that the abstinence alone wasn’t sufficient- particularly since to all outward appearance, we were an unmarried couple, living together and all that it implies- but we had no other option. At any rate, we went through the year of RCIA, abstaining, preparing for both the missing sacraments and the sacrament of marriage. On the Tuesday of Holy Week, Father called and asked if we could come the next day (Wednesday) to have our confessions heard and to be married, so that’s what we did. We had our confessions heard, on the Wednesday of Holy Week, at 11am, received the sacrament of marriage at 1pm, that same day, I received Confirmation and First Communion on Easter Sunday and my husband received Confirmation by the bishop, several weeks later.
All of that to say- everything was made whole and complete, but it involved sacrificing a “wedding”, with all the bells and whistles, and involved following Father’s instructions and timing. It was sometimes frustrating and difficult, but it also culminated in the single most beautiful, spiritual, blessed week of my entire life, outside of the birth of our daughter.
There is ALWAYS a way to come back into the Church and to make everything whole. You just need to let your priest map it out for you and then follow those instructions, as faithfully as you can.