The core of your deck sounds solid. Null is a great fit for “Reg Anarch” (fixed breakers + datasuckers, money, Parasites, some disruption like Maw).
The first question is probably, Am I playing the deck to its strengths? This is not a personal attack, but after a long break your play may have slipped, both in general and against the meta. It was always easy for me to blame my deck when in reality it was more often me making poor decisions.
Second question: is Reg Anarch well positioned in your meta? If asset strategies are common, do yourself a kindness and play Whizzard. If mid-range and glacier is common, your Null should be a great choice.
If you determine that your play is sound and your deck is reasonably positioned, come back with a full list so we can get a full picture of the deck in question.