The Church encourages all the faithful to participate fully in the liturgy and to renew their relationship with God. Returning to the liturgy is seen as a return to the heart of the Church, where the Eucharist is the "source and summit of the Christian life" (CCC 1324).
We welcome and encourage you to come to Mass, even if it has been a while. God ever invites us into a relationship with Himself, though it isn't on our own terms. Reception of the Holy Eucharist is for those who are properly prepared.