Rituals for communication, feedback, and check-ins at various levels. 1 on 1s, weekly standups (per team), monthly team-retros, monthly all-hands, quarterly OKR goal-setting… (We just started to introduce professional development check-ins with managers and ICs)
Being remote I feel like you have to mature as an organization faster. Many of these rituals we were doing with our company size at less than 10. With an office environment you may not need all the rituals and process to keep your team/culture aligned.