RPi server running on Core snap won't boot / recovery mode not working

Hello - nextcloud server running on Rpi4 stopped working and I just noticed today from client machine. Connected to KB/mouse/monitor and boot freezes at the core logo. Tried to enter recovery mode by pressing ‘1’, holding ‘1’, 'mashing ‘1’ to no avail. I have my backup files on client, but would love to keep my server build - I had it configured just right. Any help appreciated!