An RMD cannot be converted to Roth because an RMD is ineligible for rollover and the tax code defines a Roth conversion as a taxable rollover. Also, the first distributions from your traditional IRA in 2021 are considered to be the RMD for 2021, so until you have satisfied the RMD for that traditional IRA account, no conversions to Roth from that account are permitted. The RMD must be satisfied first.
