Yes, you are still eligible if you took a year off and did not purchase DGS tickets allocated to you during that off year. You will need to contact the Placement team and let them know of your plans and any changes to camp leadership by the December that precedes the year you want to return.
Placement will be determining a new practice for allocating DGS tickets for 2021. Please read this Burning Man Journal post on how DGS was allocated in 2020 and this Burning Man Journal post about the reasons leading to this.