If the handset will power on (and it's just the screen that's not functioning) then have a look at a program called 'scrcpy'. You'll need to download it to a PC and connect the handset via USB. It will replicate the handset screen on the PC and allow you to see device content. We use it in DF labs.
Other than that then you'll be looking at if you've any backups to Samsung or Google account which can be accessed / restored to a new handset, or failing that, getting your A21 repaired.
Ciaoarif I don't think I did Sync them on my old fone & can't remember wot Gmail I used ? I'm not very Savvy when it comes to this things. Just took my fone for Granted until it was to late. Cheers for your help