With Corona rates still high in many communities, we cannot recommend immersion for spiritual purposes, such as for teshuvah on Erev Yom Kippur.
Mikveh for women following niddah is a high priority because it’s a halachic requirement. It can also be done safely by taking a number of precautions. These are less feasible when many women immerse within the same time-frame, as on Erev Yom Kippur.
Since refraining from immersion this year isn’t a personal choice, there is no need for hatarat nedarim (an annulment of vows typically associated with diverging from one’s customary practice). We hope you are able to experience a meaningful Yom Kippur nevertheless.
Yom Kippur 5782: Mikveh immersion Erev Yom Kippur depends on the Corona situation in your area, and on local health department policy.
Gemar chatimah tovah!