Do I need a safety pilot or an instructor to stay instrument current?
To stay instrument current you only need a safety pilot, not an instructor. Under 14 CFR § 91.109(c) the safety pilot must hold at least a private pilot certificate with the appropriate category and class ratings — they don't have to be a CFII. With that safety pilot in the other seat, you can fly the six approaches, holding, and course tracking that § 61.57(c) requires within the preceding six calendar months. The exception: once you've been out of currency for more than six calendar months, § 61.57(d) requires an Instrument Proficiency Check given by a CFII or other authorized evaluator — a safety pilot is no longer enough. Aviate Success can serve as your safety pilot or, when you've lapsed too far, the CFII for your IPC, at KFXE, KPMP, and KHWO.