I need my WIX DNS settings changing to stop my emails bouncing

Description

I I have my domains registered with IONOS
My domain is pointed to WIX nameservers.
Whenever I send an email to gmail accounts it bounces back with error on SPF and DKIM.
Ive upated my SPF record as advised on WIX but emails are still failing on DKIMS
I need this issue resolving but don't know how to generate a DKIM Key and implement it
I imagine it to be a really quick fix so ned a WIX and email specialist or somebody who understands the Gmail security issue regarding emails:
here is the error message:
MTP error from remote server for TEXT command, host: gmail-smtp-in.l.google.com (142.251.31.26) reason: 550-5.7.26 This mail is unauthenticated, which poses a security risk to the550-5.7.26 sender and Gmail users, and has been blocked. The sender must550-5.7.26 authenticate with at least one of SPF or DKIM. For this message,550-5.7.26 DKIM checks did not pass and SPF check for [bloomfieldart.co.uk] did550-5.7.26 not pass with ip: [212.227.126.187]. The sender should visit550-5.7.26 https://support.google.com/mail/answer/81126#authentication for550 5.7.26 instructions on setting up authentication. u24-20020aa7d998000000b00514b8ff7f6fsi2886421eds.203 - gsmtp